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.

The remote RockyLinux 9 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:19356 advisory.

    * libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel     establishment (CVE-2026-5119)

Tenable has extracted the preceding description block directly from the RockyLinux 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 Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:21686 advisory.

    The libsoup packages provide an HTTP client and server library for GNOME.

    Security Fix(es):

    * libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel     establishment (CVE-2026-5119)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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.

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 version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2026:0368 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2026-5119:
    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.

Tenable has extracted the preceding description block directly from the Tencent 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 Alibaba Cloud Linux 3 host has packages installed that are affected by a vulnerability as referenced in the ALINUX3-SA-2026:0124 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2026-5119:
    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.

Tenable has extracted the preceding description block directly from the Alibaba Cloud 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 Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:19143 advisory.

    Libsoup is an HTTP library implementation in C. It was originally part of a SOAP (Simple Object Access     Protocol) implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate     packages.  libsoup uses the Glib main loop and is designed to work well with GTK applications. This     enables GNOME applications to access HTTP servers on the network in a completely asynchronous fashion,     very similar to the Gtk+ programming model (a synchronous operation mode is also supported for those who     want it), but the SOAP parts were removed long ago.

    Security Fix(es):

    * libsoup: libsoup: Denial of Service via Use-After-Free in HTTP/2 server (CVE-2026-4271)

    * libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel     establishment (CVE-2026-5119)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:19356 advisory.

    The libsoup packages provide an HTTP client and server library for GNOME.

    Security Fix(es):

    * libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel     establishment (CVE-2026-5119)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:17482 advisory.

    Libsoup is an HTTP library implementation in C. It was originally part of a SOAP (Simple Object Access     Protocol) implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate     packages.  libsoup uses the Glib main loop and is designed to work well with GTK applications. This     enables GNOME applications to access HTTP servers on the network in a completely asynchronous fashion,     very similar to the Gtk+ programming model (a synchronous operation mode is also supported for those who     want it), but the SOAP parts were removed long ago.

    Security Fix(es):

    * libsoup: libsoup: Denial of Service via Use-After-Free in HTTP/2 server (CVE-2026-4271)

    * libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel     establishment (CVE-2026-5119)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:15968 advisory.

    * libsoup: libsoup: Denial of Service via Use-After-Free in HTTP/2 server (CVE-2026-4271)

    * libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel     establishment (CVE-2026-5119)

Tenable has extracted the preceding description block directly from the RockyLinux 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 Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-15968 advisory.

    - Add patches for CVE-2026-4271 and CVE-2026-5119
    - Add patch for CVE-2026-1761
    - Fix CVE-2026-0719
    - Fix CVE-2025-14523
    - Add patch for CVE-2025-12105

Tenable has extracted the preceding description block directly from the Oracle Linux 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 Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:15968 advisory.

    Libsoup is an HTTP library implementation in C. It was originally part of a SOAP (Simple Object Access     Protocol) implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate     packages.  libsoup uses the Glib main loop and is designed to work well with GTK applications. This     enables GNOME applications to access HTTP servers on the network in a completely asynchronous fashion,     very similar to the Gtk+ programming model (a synchronous operation mode is also supported for those who     want it), but the SOAP parts were removed long ago.

    Security Fix(es):

    * libsoup: libsoup: Denial of Service via Use-After-Free in HTTP/2 server (CVE-2026-4271)

    * libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel     establishment (CVE-2026-5119)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 MiracleLinux 8 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2026-596:09 advisory.

    * libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel     establishment (CVE-2026-5119)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 MiracleLinux 9 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2026-573:08 advisory.

    * libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel     establishment (CVE-2026-5119)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2026:14087 advisory.

    * libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel     establishment (CVE-2026-5119)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-14087 advisory.

    - Backport patch for CVE-2026-5119

Tenable has extracted the preceding description block directly from the Oracle 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 RockyLinux 9 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:13978 advisory.

    * libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel     establishment (CVE-2026-5119)

Tenable has extracted the preceding description block directly from the RockyLinux 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 RockyLinux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:14087 advisory.

    * libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel     establishment (CVE-2026-5119)

Tenable has extracted the preceding description block directly from the RockyLinux 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 Oracle Linux 9 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-13978 advisory.

    [2.72.0-12.6]
    - Backport patch for CVE-2026-5119

Tenable has extracted the preceding description block directly from the Oracle 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 Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:13978 advisory.

    The libsoup packages provide an HTTP client and server library for GNOME.

    Security Fix(es):

    * libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel     establishment (CVE-2026-5119)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:14087 advisory.

    The libsoup packages provide an HTTP client and server library for GNOME.

    Security Fix(es):

    * libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel     establishment (CVE-2026-5119)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 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. 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)

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

ID	Name	Product	Family	Severity
317497	RockyLinux 9 : libsoup (RLSA-2026:19356)	Nessus	Rocky Linux Local Security Checks	high
317458	RHEL 9 : libsoup (RHSA-2026:21686)	Nessus	Red Hat Local Security Checks	high
316949	Amazon Linux 2023 : libsoup, libsoup-devel (ALAS2023-2026-1758)	Nessus	Amazon Linux Local Security Checks	high
316687	TencentOS Server 3: libsoup (TSSA-2026:0368)	Nessus	Tencent Local Security Checks	high
316639	Alibaba Cloud Linux 3 : 0124: libsoup (ALINUX3-SA-2026:0124)	Nessus	Alibaba Cloud Linux Local Security Checks	high
315509	RHEL 10 : libsoup3 (RHSA-2026:19143)	Nessus	Red Hat Local Security Checks	high
315467	RHEL 9 : libsoup (RHSA-2026:19356)	Nessus	Red Hat Local Security Checks	high
314643	RHEL 10 : libsoup3 (RHSA-2026:17482)	Nessus	Red Hat Local Security Checks	high
314423	RockyLinux 10 : libsoup3 (RLSA-2026:15968)	Nessus	Rocky Linux Local Security Checks	high
314281	Oracle Linux 10 : libsoup3 (ELSA-2026-15968)	Nessus	Oracle Linux Local Security Checks	high
314244	RHEL 10 : libsoup3 (RHSA-2026:15968)	Nessus	Red Hat Local Security Checks	high
314166	MiracleLinux 8 : libsoup-2.62.3-14.el8_10 (AXSA:2026-596:09)	Nessus	Miracle Linux Local Security Checks	high
313229	MiracleLinux 9 : libsoup-2.72.0-12.el9_7.6 (AXSA:2026-573:08)	Nessus	Miracle Linux Local Security Checks	high
313193	AlmaLinux 8 : libsoup (ALSA-2026:14087)	Nessus	Alma Linux Local Security Checks	high
313043	Oracle Linux 8 : libsoup (ELSA-2026-14087)	Nessus	Oracle Linux Local Security Checks	high
313038	RockyLinux 9 : libsoup (RLSA-2026:13978)	Nessus	Rocky Linux Local Security Checks	high
313018	RockyLinux 8 : libsoup (RLSA-2026:14087)	Nessus	Rocky Linux Local Security Checks	high
312826	Oracle Linux 9 : libsoup (ELSA-2026-13978)	Nessus	Oracle Linux Local Security Checks	high
312658	RHEL 9 : libsoup (RHSA-2026:13978)	Nessus	Red Hat Local Security Checks	high
312655	RHEL 8 : libsoup (RHSA-2026:14087)	Nessus	Red Hat Local Security Checks	high
309074	Linux Distros Unpatched Vulnerability : CVE-2026-5119	Nessus	Misc.	high

Detections

Analytics

CVE-2026-5119

high

Tenable Plugins

high

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