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 Red Hat Enterprise Linux 10 and related products, contains two vulnerabilities. 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, potentially leading to information disclosure. Red Hat Product Security has issued a security advisory (RHSA-2026:15968) and released updated libsoup3 packages (version 3.6.5-3.el10_1.11) to fix these issues. The advisory rates the impact as moderate. The update applies to multiple architectures including x86_64, s390x, ppc64le, and aarch64 for Red Hat Enterprise Linux 10 and CodeReady Linux Builder 10. No CVSS scores are provided in the advisory. No known exploits in the wild have been reported at this time.
Potential Impact
The use-after-free vulnerability (CVE-2026-4271) can cause denial of service in the HTTP/2 server component of libsoup3. The information disclosure vulnerability (CVE-2026-5119) may expose cookies transmitted in cleartext during HTTPS tunnel establishment, potentially compromising user privacy or session integrity. Both issues affect Red Hat Enterprise Linux 10 and related CodeReady Linux Builder products. The overall security impact is rated moderate by Red Hat.
Mitigation Recommendations
Red Hat has released updated libsoup3 packages (version 3.6.5-3.el10_1.11) that address these vulnerabilities. Users should apply the security update for Red Hat Enterprise Linux 10 and related CodeReady Linux Builder products following Red Hat's official guidance at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated in the advisory. Patch status is confirmed as fixed in the updated packages.
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 Red Hat Enterprise Linux 10 and related products, contains two vulnerabilities. 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, potentially leading to information disclosure. Red Hat Product Security has issued a security advisory (RHSA-2026:15968) and released updated libsoup3 packages (version 3.6.5-3.el10_1.11) to fix these issues. The advisory rates the impact as moderate. The update applies to multiple architectures including x86_64, s390x, ppc64le, and aarch64 for Red Hat Enterprise Linux 10 and CodeReady Linux Builder 10. No CVSS scores are provided in the advisory. No known exploits in the wild have been reported at this time.
Potential Impact
The use-after-free vulnerability (CVE-2026-4271) can cause denial of service in the HTTP/2 server component of libsoup3. The information disclosure vulnerability (CVE-2026-5119) may expose cookies transmitted in cleartext during HTTPS tunnel establishment, potentially compromising user privacy or session integrity. Both issues affect Red Hat Enterprise Linux 10 and related CodeReady Linux Builder products. The overall security impact is rated moderate by Red Hat.
Mitigation Recommendations
Red Hat has released updated libsoup3 packages (version 3.6.5-3.el10_1.11) that address these vulnerabilities. Users should apply the security update for Red Hat Enterprise Linux 10 and related CodeReady Linux Builder products following Red Hat's official guidance at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated in the advisory. Patch status is confirmed as fixed in the updated packages.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:15968
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-5119"]
- State
- PUBLISHED
Threat ID: 6a18ab6be29bf47b5028761d
Added to database: 05/28/2026, 20:54:03 UTC
Last enriched: 07/13/2026, 10:53:55 UTC
Last updated: 09/14/2026, 22:01:35 UTC
Views: 70
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