A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-decoded input used to create the Host header. A remote attacker can exploit this by providing a specially crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by the proxy, potentially impacting downstream services.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return
    Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-
    decoded input used to create the Host header. A remote attacker can exploit this by providing a specially
    crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP
    request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by the proxy,
    potentially impacting downstream services. (CVE-2026-1467)

The AlmaLinux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1776763910 advisory.

  - A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return     Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-     decoded input used to create the Host header. A remote attacker can exploit this by providing a specially     crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP     request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by the proxy,     potentially impacting downstream services. (CVE-2026-1467)

  - A flaw was found in the libsoup HTTP library that can cause proxy authentication credentials to be sent to     unintended destinations. When handling HTTP redirects, libsoup removes the Authorization header but does     not remove the Proxy-Authorization header if the request is redirected to a different host. As a result,     sensitive proxy credentials may be leaked to third-party servers. Applications using libsoup for HTTP     communication may unintentionally expose proxy authentication data. (CVE-2026-1539)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Rocky Linux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1776763910 advisory.

  - A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return     Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-     decoded input used to create the Host header. A remote attacker can exploit this by providing a specially     crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP     request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by the proxy,     potentially impacting downstream services. (CVE-2026-1467)

  - A flaw was found in the libsoup HTTP library that can cause proxy authentication credentials to be sent to     unintended destinations. When handling HTTP redirects, libsoup removes the Authorization header but does     not remove the Proxy-Authorization header if the request is redirected to a different host. As a result,     sensitive proxy credentials may be leaked to third-party servers. Applications using libsoup for HTTP     communication may unintentionally expose proxy authentication data. (CVE-2026-1539)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The AlmaLinux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1776763201 advisory.

  - A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return     Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-     decoded input used to create the Host header. A remote attacker can exploit this by providing a specially     crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP     request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by the proxy,     potentially impacting downstream services. (CVE-2026-1467)

  - A flaw was found in the libsoup HTTP library that can cause proxy authentication credentials to be sent to     unintended destinations. When handling HTTP redirects, libsoup removes the Authorization header but does     not remove the Proxy-Authorization header if the request is redirected to a different host. As a result,     sensitive proxy credentials may be leaked to third-party servers. Applications using libsoup for HTTP     communication may unintentionally expose proxy authentication data. (CVE-2026-1539)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS / Pro Realtime 24.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8780-1 advisory.

    It was discovered that libsoup incorrectly handled certain URLs when using an HTTP proxy. A remote     attacker could possibly use this issue to inject arbitrary HTTP headers. (CVE-2026-1467)

    It was discovered that libsoup did not remove proxy authentication credentials when following HTTP     redirects. A remote attacker could possibly use this issue to obtain sensitive information.
    (CVE-2026-1539)

    Ahmed Lekssays discovered that libsoup incorrectly parsed certain HTTP requests. A remote attacker could     possibly use this issue to obtain sensitive information. (CVE-2026-1801)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1778 advisory.

    OOB Read via Integer Overflow on libsoup through libsoup/websocket/soup-websocket-connection.c via     process_frame() leads to Undefined Behavior (CVE-2026-0716)

    A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return     Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-     decoded input used to create the Host header. A remote attacker can exploit this by providing a specially     crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP     request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by the proxy,     potentially impacting downstream services. (CVE-2026-1467)

    A flaw was found in SoupServer. This HTTP request smuggling vulnerability occurs because SoupServer     improperly handles requests that combine Transfer-Encoding: chunked and Connection: keep-alive headers. A     remote, unauthenticated client can exploit this by sending specially crafted requests, causing SoupServer     to fail to close the connection as required by RFC 9112. This allows the attacker to smuggle additional     requests over the persistent connection, leading to unintended request processing and potential denial-of-     service (DoS) conditions. (CVE-2026-1760)

    A flaw was found in libsoup. This stack-based buffer overflow vulnerability occurs during the parsing of     multipart HTTP responses due to an incorrect length calculation. A remote attacker can exploit this by     sending a specially crafted multipart HTTP response, which can lead to memory corruption. This issue may     result in application crashes or arbitrary code execution in applications that process untrusted server     responses, and it does not require authentication or user interaction. (CVE-2026-1761)

    A flaw was found in libsoup, an HTTP client/server library. This HTTP Request Smuggling vulnerability     arises from non-RFC-compliant parsing in the soup_filter_input_stream_read_line() logic, where libsoup     accepts malformed chunk headers, such as lone line feed (LF) characters instead of the required carriage     return and line feed (CRLF). A remote attacker can exploit this without authentication or user interaction     by sending specially crafted chunked requests. This allows libsoup to parse and process multiple HTTP     requests from a single network message, potentially leading to information disclosure. (CVE-2026-1801)

    Denial of Service via use-after-free in SoupServer during TLS handshake (CVE-2026-2436)

    libsoup includes an embedded HTTP/1 server. When a server sits behind a proxy / load balancer, it's     critical that every hop agrees on how request bodies are framed.In the affected code path, libsoup     accepted HTTP/1 requests with ambiguous body framing:

    multiple Content-Length headers (CL.CL)

    Transfer-Encoding: chunked together with Content-Length (TE+CL)

    Different intermediaries pick different framing rules in these cases. If a front-end and back-end     disagree, an attacker can desynchronize the connection and smuggle an extra request through the chain.
    Depending on deployment, this can lead to routing/ACL bypass, cache poisoning, or reaching internal-only     endpoints. (CVE-2026-2708)

    A flaw was found in libsoup. When establishing HTTPS tunnels through a configured HTTP proxy, sensitive     session cookies are transmitted in cleartext within the initial HTTP CONNECT request. A network-positioned     attacker or a malicious HTTP proxy can intercept these cookies, leading to potential session hijacking or     user impersonation. (CVE-2026-5119)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1758 advisory.

    OOB Read via Integer Overflow on libsoup through libsoup/websocket/soup-websocket-connection.c via     process_frame() leads to Undefined Behavior (CVE-2026-0716)

    A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return     Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-     decoded input used to create the Host header. A remote attacker can exploit this by providing a specially     crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP     request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by the proxy,     potentially impacting downstream services. (CVE-2026-1467)

    A flaw was found in SoupServer. This HTTP request smuggling vulnerability occurs because SoupServer     improperly handles requests that combine Transfer-Encoding: chunked and Connection: keep-alive headers. A     remote, unauthenticated client can exploit this by sending specially crafted requests, causing SoupServer     to fail to close the connection as required by RFC 9112. This allows the attacker to smuggle additional     requests over the persistent connection, leading to unintended request processing and potential denial-of-     service (DoS) conditions. (CVE-2026-1760)

    A flaw was found in libsoup. This stack-based buffer overflow vulnerability occurs during the parsing of     multipart HTTP responses due to an incorrect length calculation. A remote attacker can exploit this by     sending a specially crafted multipart HTTP response, which can lead to memory corruption. This issue may     result in application crashes or arbitrary code execution in applications that process untrusted server     responses, and it does not require authentication or user interaction. (CVE-2026-1761)

    A flaw was found in libsoup, an HTTP client/server library. This HTTP Request Smuggling vulnerability     arises from non-RFC-compliant parsing in the soup_filter_input_stream_read_line() logic, where libsoup     accepts malformed chunk headers, such as lone line feed (LF) characters instead of the required carriage     return and line feed (CRLF). A remote attacker can exploit this without authentication or user interaction     by sending specially crafted chunked requests. This allows libsoup to parse and process multiple HTTP     requests from a single network message, potentially leading to information disclosure. (CVE-2026-1801)

    A flaw was found in libsoup. When establishing HTTPS tunnels through a configured HTTP proxy, sensitive     session cookies are transmitted in cleartext within the initial HTTP CONNECT request. A network-positioned     attacker or a malicious HTTP proxy can intercept these cookies, leading to potential session hijacking or     user impersonation. (CVE-2026-5119)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-014298 advisory.

    A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return     Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-     decoded input used to create the Host header. A remote attacker can exploit this by providing a specially     crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP     request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by the proxy,     potentially impacting downstream services.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20354-1 advisory.

    - CVE-2025-4476: null pointer dereference may lead to denial of service (bsc#1243422).
    - CVE-2025-14523: Duplicate Host Header Handling Causes Host-Parsing Discrepancy (bsc#1254876).
    - CVE-2025-32049: Denial of Service attack to websocket server (bsc#1240751).
    - CVE-2026-0716: improper bounds handling may allow out-of-bounds read (bsc#1256418).
    - CVE-2026-0719: stack-based buffer overflow in NTLM authentication can lead to arbitrary code execution     (bsc#1256399).
    - CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests     (bsc#1257398).
    - CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling     HTTP redirects       (bsc#1257441).
    - CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to     HTTP request       smuggling and potential DoS (bsc#1257597).
    - CVE-2026-2369: Buffer overread due to integer underflow when handling zero-length resources     (bsc#1258120).
    - CVE-2026-2443: out-of-bounds read when processing specially crafted HTTP Range headers can lead to heap     information       disclosure to remote attackers (bsc#1258170).
    - CVE-2026-2708: HTTP request smuggling via duplicate Content-Length headers (bsc#1258508).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0834-1 advisory.

    - CVE-2025-32049: denial of service attack to websocket server (bsc#1240751).
    - CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests     (bsc#1257398).
    - CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling     HTTP redirects       (bsc#1257441).
    - CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to     HTTP request       smuggling and potential DoS (bsc#1257597).
    - CVE-2026-2369: buffer overread due to integer underflow when handling zero-length resources     (bsc#1258120).
    - CVE-2026-2443: out-of-bounds read when processing specially crafted HTTP Range headers can lead to heap     information       disclosure to remote attackers (bsc#1258170).
    - CVE-2026-2708: HTTP request smuggling via duplicate Content-Length headers (bsc#1258508).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0833-1 advisory.

    - CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests     (bsc#1257398).
    - CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling     HTTP redirects       (bsc#1257441).
    - CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to     HTTP request       smuggling and potential DoS (bsc#1257597).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0796-1 advisory.

    - CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests     (bsc#1257398).
    - CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling     HTTP redirects       (bsc#1257441).
    - CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to     HTTP request       smuggling and potential DoS (bsc#1257597).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0811-1 advisory.

    - CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests     (bsc#1257398).
    - CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling     HTTP redirects       (bsc#1257441).
    - CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to     HTTP request       smuggling and potential DoS (bsc#1257597).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0788-1 advisory.

    - CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests     (bsc#1257398).
    - CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling     HTTP redirects       (bsc#1257441).
    - CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to     HTTP request       smuggling and potential DoS (bsc#1257597).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8020-1 advisory.

    It was discovered that libsoup did not correctly handle certain URL-decoded input, which could allow for     HTTP header injection. A remote attacker could possibly use this issue to cause a denial of service or     execute arbitrary code. (CVE-2026-1467, CVE-2026-1536)

    It was discovered that libsoup did not correctly handle removal of the Proxy-Authorization header. A     remote attacker could possibly use this issue to leak sensitive information. (CVE-2026-1539)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return     Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-     decoded input used to create the Host header. A remote attacker can exploit this by providing a specially     crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP     request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by the proxy,     potentially impacting downstream services. (CVE-2026-1467)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
461505	Echo: libsoup3: security update to 3.6.5-8	Tenable Cloud Security	Echo Local Security Checks	Local	medium
461505	Echo: libsoup3: security update to 3.6.5-8	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
362364	AlmaLinux 9.6 [TuxCare] Security Update: libsoup / libsoup-devel / libsoup-doc Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1776763910)	Nessus	Alma Linux Local Security Checks	Local	medium
361632	Rocky Linux 9.6 [TuxCare] Security Update: libsoup / libsoup-devel / libsoup-doc Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1776763910)	Nessus	Rocky Linux Local Security Checks	Local	medium
352868	AlmaLinux 9.2 [TuxCare] Security Update: libsoup / libsoup-devel / libsoup-doc Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1776763201)	Nessus	Alma Linux Local Security Checks	Local	medium
348241	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS / Pro Realtime 24.04 LTS : libsoup vulnerabilities (USN-8780-1)	Nessus	Ubuntu Local Security Checks	Local	medium
319827	Amazon Linux 2023 : libsoup3, libsoup3-devel (ALAS2023-2026-1778)	Nessus	Amazon Linux Local Security Checks	Local	high
316949	Amazon Linux 2023 : libsoup, libsoup-devel (ALAS2023-2026-1758)	Nessus	Amazon Linux Local Security Checks	Local	high
309997	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: libsoup (UTSA-2026-014298)	Nessus	Unity Linux Local Security Checks	Local	medium
302341	openSUSE 16 Security Update : libsoup2 (openSUSE-SU-2026:20354-1)	Nessus	SuSE Local Security Checks	Local	high
301458	SUSE SLES15 Security Update : libsoup2 (SUSE-SU-2026:0834-1)	Nessus	SuSE Local Security Checks	Local	medium
301413	SUSE SLES15 Security Update : libsoup (SUSE-SU-2026:0833-1)	Nessus	SuSE Local Security Checks	Local	medium
301306	SUSE SLES12 Security Update : libsoup (SUSE-SU-2026:0796-1)	Nessus	SuSE Local Security Checks	Local	medium
301284	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : libsoup2 (SUSE-SU-2026:0811-1)	Nessus	SuSE Local Security Checks	Local	medium
300863	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : libsoup (SUSE-SU-2026:0788-1)	Nessus	SuSE Local Security Checks	Local	medium
298468	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : libsoup vulnerabilities (USN-8020-1)	Nessus	Ubuntu Local Security Checks	Local	medium
296742	Linux Distros Unpatched Vulnerability : CVE-2026-1467	Nessus	Misc.	Local	medium

Detections

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CVE-2026-1467

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Tenable Plugins

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