A flaw was identified in libsoup, a widely used HTTP library in GNOME-based systems. When processing specially crafted HTTP Range headers, the library may improperly validate requested byte ranges. In certain build configurations, this could allow a remote attacker to access portions of server memory beyond the intended response. Exploitation requires a vulnerable configuration and access to a server using the embedded SoupServer component.

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

  - A flaw was identified in libsoup, a widely used HTTP library in GNOME-based systems. When processing
    specially crafted HTTP Range headers, the library may improperly validate requested byte ranges. In
    certain build configurations, this could allow a remote attacker to access portions of server memory
    beyond the intended response. Exploitation requires a vulnerable configuration and access to a server
    using the embedded SoupServer component. (CVE-2026-2443)

The AlmaLinux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1776854729 advisory.

  - 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 identified in libsoup, a widely used HTTP library in GNOME-based systems. When processing     specially crafted HTTP Range headers, the library may improperly validate requested byte ranges. In     certain build configurations, this could allow a remote attacker to access portions of server memory     beyond the intended response. Exploitation requires a vulnerable configuration and access to a server     using the embedded SoupServer component. (CVE-2026-2443)

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

The AlmaLinux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1776855452 advisory.

  - 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 identified in libsoup, a widely used HTTP library in GNOME-based systems. When processing     specially crafted HTTP Range headers, the library may improperly validate requested byte ranges. In     certain build configurations, this could allow a remote attacker to access portions of server memory     beyond the intended response. Exploitation requires a vulnerable configuration and access to a server     using the embedded SoupServer component. (CVE-2026-2443)

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-2026:1776855452 advisory.

  - 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 identified in libsoup, a widely used HTTP library in GNOME-based systems. When processing     specially crafted HTTP Range headers, the library may improperly validate requested byte ranges. In     certain build configurations, this could allow a remote attacker to access portions of server memory     beyond the intended response. Exploitation requires a vulnerable configuration and access to a server     using the embedded SoupServer component. (CVE-2026-2443)

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

According to the versions of the libsoup packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    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's WebSocket frame processing when handling incoming messages. If a non-default     configuration is used where the maximum incoming payload size is unset, the library may read memory     outside the intended bounds. This can cause unintended memory exposure or a crash. Applications using     libsoup's WebSocket support with this configuration may be impacted.(CVE-2026-0716)

    A flaw was identified in libsoup, a widely used HTTP library in GNOME-based systems. When processing     specially crafted HTTP Range headers, the library may improperly validate requested byte ranges. In     certain build configurations, this could allow a remote attacker to access portions of server memory     beyond the intended response. Exploitation requires a vulnerable configuration and access to a server     using the embedded SoupServer component.(CVE-2026-2443)

    A flaw was found in libsoup. An integer underflow vulnerability occurs when processing content with a     zero-length resource, leading to a buffer overread. This can allow an attacker to potentially access     sensitive information or cause an application level denial of service.(CVE-2026-2369)

Tenable has extracted the preceding description block directly from the EulerOS libsoup 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 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 SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0703-1 advisory.

    - CVE-2026-0716: improper bounds handling may allow out-of-bounds read (bsc#1256418).
    - CVE-2025-4476: null pointer dereference may lead to denial of service (bsc#1243422).
    - CVE-2025-32049: denial of Service attack to websocket server (bsc#1240751).
    - 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 SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0657-1 advisory.

    - CVE-2025-32049: denial of Service attack to websocket server (bsc#1240751).
    - 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 SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0690-1 advisory.

    - CVE-2025-32049: denial of Service attack to websocket server (bsc#1240751).
    - 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-2026:0689-1 advisory.

    - CVE-2025-32049: denial of Service attack to websocket server (bsc#1240751).
    - 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A flaw was identified in libsoup, a widely used HTTP library in GNOME-based systems. When processing     specially crafted HTTP Range headers, the library may improperly validate requested byte ranges. In     certain build configurations, this could allow a remote attacker to access portions of server memory     beyond the intended response. Exploitation requires a vulnerable configuration and access to a server     using the embedded SoupServer component. (CVE-2026-2443)

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

ID	Name	Product	Family	Type	Severity
459275	Echo: libsoup3: security update to 3.6.6-1	Tenable Cloud Security	Echo Local Security Checks	Local	medium
459275	Echo: libsoup3: security update to 3.6.6-1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
361629	AlmaLinux 9.2 [TuxCare] Security Update: libsoup / libsoup-devel / libsoup-doc Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1776854729)	Nessus	Alma Linux Local Security Checks	Local	medium
352312	AlmaLinux 9.6 [TuxCare] Security Update: libsoup / libsoup-devel / libsoup-doc Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1776855452)	Nessus	Alma Linux Local Security Checks	Local	medium
352296	Rocky Linux 9.6 [TuxCare] Security Update: libsoup / libsoup-devel / libsoup-doc Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1776855452)	Nessus	Rocky Linux Local Security Checks	Local	medium
319965	EulerOS 2.0 SP11 : libsoup (EulerOS-SA-2026-2213)	Nessus	Huawei Local Security Checks	Local	critical
319941	EulerOS 2.0 SP11 : libsoup (EulerOS-SA-2026-2251)	Nessus	Huawei Local Security Checks	Local	critical
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
300651	SUSE SLES12 Security Update : libsoup (SUSE-SU-2026:0703-1)	Nessus	SuSE Local Security Checks	Local	medium
300582	SUSE SLED15: libsoup-2_4-1 / libsoup-2_4-1-32bit / libsoup2-devel / etc (SUSE-SU-2026:0657-1)	Nessus	SuSE Local Security Checks	Local	critical
300249	SUSE SLED15: libsoup-3_0-0 / libsoup-3_0-0-32bit / libsoup-devel / etc (SUSE-SU-2026:0690-1)	Nessus	SuSE Local Security Checks	Local	critical
300248	SUSE SLES15 Security Update : libsoup (SUSE-SU-2026:0689-1)	Nessus	SuSE Local Security Checks	Local	medium
299000	Linux Distros Unpatched Vulnerability : CVE-2026-2443	Nessus	Misc.	Local	medium

Detections

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CVE-2026-2443

medium

Tenable Plugins

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critical

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