RLSA-2026:98453: Important: libsoup security update
The libsoup packages provide an HTTP client and server library for GNOME.
Security Fix(es):
SoupWebsocketExtensionDeflate: libsoup: libsoup: WebSocket permessage-deflate Unbounded Decompression Remote Denial of Service (CVE-2026-15709)
libsoup: SoupWebsocketConnection: libsoup: WebSocket remote denial of service via oversized control frame protocol violation (CVE-2026-15711)
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
rocky-linux/libsoupto a version that resolves this vulnerability.Fixed in 0:2.72.0-17.el9_9.6 - Upgrade
Upgrade
rocky-linux/libsoup-debuginfoto a version that resolves this vulnerability.Fixed in 0:2.72.0-17.el9_9.6 - Upgrade
Upgrade
rocky-linux/libsoup-debugsourceto a version that resolves this vulnerability.Fixed in 0:2.72.0-17.el9_9.6 - Upgrade
Upgrade
rocky-linux/libsoup-develto a version that resolves this vulnerability.Fixed in 0:2.72.0-17.el9_9.6
Event History
Child vulnerabilities
Contains the following vulnerabilities.
Frequently Asked Questions
Is exposure limited to WebSocket functionality?
The listed issues all involve WebSocket processing, including permessage-deflate, control frames, Pong handling, message reassembly, receive-buffer growth, and client-frame masking. The supplied advisory does not state whether applications using libsoup only for non-WebSocket HTTP traffic are affected.
Does the advisory provide fixed package versions or temporary mitigations?
No fixed package versions, configuration workarounds, or compensating controls are provided in the supplied advisory. It identifies the issues as security fixes in a libsoup security update.