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, a C-based HTTP library used in GNOME applications and Red Hat Enterprise Linux 10, 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, resulting in potential information disclosure. Red Hat has released security updates for libsoup3 in Red Hat Enterprise Linux 10 and related products to fix these issues. The advisory references updated packages version 3.6.5-3.el10_2.11 and provides instructions for applying the update. No CVSS scores are provided in the advisory, but the severity is rated as moderate.
Potential Impact
Successful exploitation of CVE-2026-4271 can cause denial of service by triggering a use-after-free condition in the HTTP/2 server implementation of libsoup3. CVE-2026-5119 can lead to information disclosure by transmitting cookies in cleartext during HTTPS tunnel establishment, potentially exposing sensitive session data. These vulnerabilities affect network-facing components and could impact applications relying on libsoup3 for HTTP communications.
Mitigation Recommendations
Red Hat has released updated libsoup3 packages that address these vulnerabilities. Users of Red Hat Enterprise Linux 10 and related products should apply the security update as described in the Red Hat advisory RHSA-2026:19143 and the referenced article https://access.redhat.com/articles/11258. Applying the official update is the recommended mitigation. No additional vendor-recommended 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, a C-based HTTP library used in GNOME applications and Red Hat Enterprise Linux 10, 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, resulting in potential information disclosure. Red Hat has released security updates for libsoup3 in Red Hat Enterprise Linux 10 and related products to fix these issues. The advisory references updated packages version 3.6.5-3.el10_2.11 and provides instructions for applying the update. No CVSS scores are provided in the advisory, but the severity is rated as moderate.
Potential Impact
Successful exploitation of CVE-2026-4271 can cause denial of service by triggering a use-after-free condition in the HTTP/2 server implementation of libsoup3. CVE-2026-5119 can lead to information disclosure by transmitting cookies in cleartext during HTTPS tunnel establishment, potentially exposing sensitive session data. These vulnerabilities affect network-facing components and could impact applications relying on libsoup3 for HTTP communications.
Mitigation Recommendations
Red Hat has released updated libsoup3 packages that address these vulnerabilities. Users of Red Hat Enterprise Linux 10 and related products should apply the security update as described in the Red Hat advisory RHSA-2026:19143 and the referenced article https://access.redhat.com/articles/11258. Applying the official update is the recommended mitigation. No additional vendor-recommended 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-2026:19143
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-5119"]
- State
- PUBLISHED
Threat ID: 6a18ab6be29bf47b50287636
Added to database: 05/28/2026, 20:54:03 UTC
Last enriched: 07/13/2026, 10:53:37 UTC
Last updated: 09/14/2026, 22:01:35 UTC
Views: 127
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