RHSA-2026:93445: Important: libsoup security update
The libsoup packages provide an HTTP client and server library for GNOME.Security Fix(es): libsoup: libsoup: Heap buffer overflow from WebSocket Pong signal type confusion (CVE-2026-102556) libsoup: libsoup: Heap buffer overflow during WebSocket message reassembly (CVE-2026-102557) libsoup: libsoup: Heap buffer overflow during WebSocket receive-buffer growth (CVE-2026-102558) libsoup: libsoup: Heap buffer overflow during WebSocket client-frame masking (CVE-2026-102559) libsoup: libsoup: Heap buffer overflow during outgoing permessage-deflate buffer growth (CVE-2026-102560) 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
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
redhat/libsoupto a version that resolves this vulnerability.Fixed in 2.72.0-8.el9_4.17 - Upgrade
Upgrade
redhat/libsoup-debuginfoto a version that resolves this vulnerability.Fixed in 2.72.0-8.el9_4.17 - Upgrade
Upgrade
redhat/libsoup-debugsourceto a version that resolves this vulnerability.Fixed in 2.72.0-8.el9_4.17 - Upgrade
Upgrade
redhat/libsoup-develto a version that resolves this vulnerability.Fixed in 2.72.0-8.el9_4.17 - Upgrade
Upgrade
redhat/libsoupto a version that resolves this vulnerability.Fixed in 2.72.0-8.el9_4.17.aa - Upgrade
Upgrade
redhat/libsoup-debuginfoto a version that resolves this vulnerability.Fixed in 2.72.0-8.el9_4.17.aa - Upgrade
Upgrade
redhat/libsoup-debugsourceto a version that resolves this vulnerability.Fixed in 2.72.0-8.el9_4.17.aa - Upgrade
Upgrade
redhat/libsoup-develto a version that resolves this vulnerability.Fixed in 2.72.0-8.el9_4.17.aa
Event History
Frequently Asked Questions
Which WebSocket operations are involved in these fixes?
The fixes cover Pong signal handling, message reassembly, receive-buffer growth, client-frame masking, and outgoing permessage-deflate buffer growth. The first four concern received WebSocket data handling, while the permessage-deflate issue concerns outgoing compressed-message processing.
How many CVEs are addressed by this advisory?
The advisory addresses five heap buffer overflow vulnerabilities: CVE-2026-102556, CVE-2026-102557, CVE-2026-102558, CVE-2026-102559, and CVE-2026-102560.