Red Hat Security Advisory: libsoup3 security update
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.
AI Analysis
Technical Summary
Libsoup3, an HTTP library implemented in C and used in GNOME applications, contains two vulnerabilities addressed in Red Hat Enterprise Linux 10.0 Extended Update Support. CVE-2026-4271 is a use-after-free vulnerability in the HTTP/2 server component that can lead to denial of service. CVE-2026-5119 involves the cleartext transmission of cookies during HTTPS tunnel establishment, resulting in potential information disclosure. Red Hat released updated packages (libsoup3-3.6.5-3.el10_0.15) for multiple architectures including x86_64, s390x, ppc64le, and aarch64 to remediate these issues. The advisory rates these vulnerabilities as moderate in impact. Detailed CVSS scores are not provided. The advisory references Red Hat's article on applying updates for remediation.
Potential Impact
The use-after-free vulnerability (CVE-2026-4271) can cause denial of service in applications using libsoup3's HTTP/2 server functionality. The information disclosure vulnerability (CVE-2026-5119) can expose cookies in cleartext during HTTPS tunnel establishment, potentially leaking sensitive session information. Both issues affect confidentiality and availability to a moderate degree as rated by Red Hat. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated libsoup3 packages (version 3.6.5-3.el10_0.15) for Red Hat Enterprise Linux 10.0 Extended Update Support and related CodeReady Linux Builder variants across supported architectures. Users should apply these official updates following Red Hat's guidance at https://access.redhat.com/articles/11258 to remediate the vulnerabilities. No alternative mitigations or workarounds are indicated in the advisory.
Red Hat Security Advisory: libsoup3 security update
Description
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.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Libsoup3, an HTTP library implemented in C and used in GNOME applications, contains two vulnerabilities addressed in Red Hat Enterprise Linux 10.0 Extended Update Support. CVE-2026-4271 is a use-after-free vulnerability in the HTTP/2 server component that can lead to denial of service. CVE-2026-5119 involves the cleartext transmission of cookies during HTTPS tunnel establishment, resulting in potential information disclosure. Red Hat released updated packages (libsoup3-3.6.5-3.el10_0.15) for multiple architectures including x86_64, s390x, ppc64le, and aarch64 to remediate these issues. The advisory rates these vulnerabilities as moderate in impact. Detailed CVSS scores are not provided. The advisory references Red Hat's article on applying updates for remediation.
Potential Impact
The use-after-free vulnerability (CVE-2026-4271) can cause denial of service in applications using libsoup3's HTTP/2 server functionality. The information disclosure vulnerability (CVE-2026-5119) can expose cookies in cleartext during HTTPS tunnel establishment, potentially leaking sensitive session information. Both issues affect confidentiality and availability to a moderate degree as rated by Red Hat. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated libsoup3 packages (version 3.6.5-3.el10_0.15) for Red Hat Enterprise Linux 10.0 Extended Update Support and related CodeReady Linux Builder variants across supported architectures. Users should apply these official updates following Red Hat's guidance at https://access.redhat.com/articles/11258 to remediate the vulnerabilities. No alternative mitigations or workarounds are indicated in the advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:17482
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-5119"]
- State
- PUBLISHED
Threat ID: 6a18ab6be29bf47b50287616
Added to database: 05/28/2026, 20:54:03 UTC
Last enriched: 07/13/2026, 10:53:46 UTC
Last updated: 09/14/2026, 22:01:35 UTC
Views: 89
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