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 flaw in the HTTP/2 server that can lead to denial of service. CVE-2026-5119 allows information disclosure through cleartext transmission of cookies during HTTPS tunnel setup. These issues affect multiple architectures and variants of Red Hat Enterprise Linux 10 and CodeReady Linux Builder. Red Hat has released updated libsoup3 packages to remediate these vulnerabilities as detailed in advisory RHSA-2026:15968.
Potential Impact
The use-after-free vulnerability (CVE-2026-4271) can cause denial of service conditions in affected systems running libsoup3 HTTP/2 server components. The information disclosure vulnerability (CVE-2026-5119) may expose sensitive cookie data during HTTPS tunnel establishment, potentially compromising confidentiality. Both vulnerabilities are rated as moderate impact by Red Hat. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated libsoup3 packages that fix these vulnerabilities. Users of Red Hat Enterprise Linux 10 and related products should apply the security update described in advisory RHSA-2026:15968. Detailed instructions and package downloads are available at https://access.redhat.com/articles/11258. Applying this official update is the recommended remediation. No additional mitigation steps are indicated by the vendor 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.
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 flaw in the HTTP/2 server that can lead to denial of service. CVE-2026-5119 allows information disclosure through cleartext transmission of cookies during HTTPS tunnel setup. These issues affect multiple architectures and variants of Red Hat Enterprise Linux 10 and CodeReady Linux Builder. Red Hat has released updated libsoup3 packages to remediate these vulnerabilities as detailed in advisory RHSA-2026:15968.
Potential Impact
The use-after-free vulnerability (CVE-2026-4271) can cause denial of service conditions in affected systems running libsoup3 HTTP/2 server components. The information disclosure vulnerability (CVE-2026-5119) may expose sensitive cookie data during HTTPS tunnel establishment, potentially compromising confidentiality. Both vulnerabilities are rated as moderate impact by Red Hat. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated libsoup3 packages that fix these vulnerabilities. Users of Red Hat Enterprise Linux 10 and related products should apply the security update described in advisory RHSA-2026:15968. Detailed instructions and package downloads are available at https://access.redhat.com/articles/11258. Applying this official update is the recommended remediation. No additional mitigation steps are indicated by the vendor 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-2026:15968
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-5119"]
- Cvss Version
- null
Threat ID: 6a18ab6be29bf47b5028761d
Added to database: 5/28/2026, 8:54:03 PM
Last enriched: 5/28/2026, 8:55:53 PM
Last updated: 5/29/2026, 6:57:28 AM
Views: 4
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