CVE-2026-102556

Libsoup: libsoup: heap buffer overflow from websocket pong signal type confusion

State: Published
Severity: 8.6 High
Published: Sep 29, 2026
Updated: Nov 2, 2026
Reserved: Sep 29, 2026

Description

A flaw was found in libsoup. When handling an incoming WebSocket Pong frame, SoupWebsocketConnection emitted the ::pong signal with a GByteArray pointer even though the signal is declared to pass a GBytes. Applications connecting a handler that follows the documented GBytes API can trigger heap corruption or a crash upon receiving a crafted Pong.

Scores

CVSS	Score	Vector	Source
3.1	8.6 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H	redhat

Weaknesses

CWE-843 Access of Resource Using Incompatible Type

Affected Products

Product	Versions
Red Hat Enterprise Linux 10Red Hat	0:3.6.5-3.el10_2.20 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:3.6.5-3.el10_0.19 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:2.62.2-16.el7_9 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:2.62.3-19.el8_10 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:2.62.3-19.el8_10 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:2.62.3-2.el8_4.14 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	0:2.62.3-2.el8_4.14 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:2.62.3-2.el8_6.14 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:2.62.3-2.el8_6.14 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:2.62.3-3.el8_8.15 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:2.62.3-3.el8_8.15 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:2.72.0-16.el9_8.8 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:2.72.0-8.el9_2.18 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat	0:2.72.0-8.el9_4.17 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:2.72.0-10.el9_6.14 and laterNot affected
Red Hat Enterprise Linux 6Red Hat

References

RHSA-2026:83384vendor-advisory
RHSA-2026:83618vendor-advisory
RHSA-2026:84586vendor-advisory
RHSA-2026:92347vendor-advisory
RHSA-2026:93445vendor-advisory
RHSA-2026:93446vendor-advisory
RHSA-2026:93447vendor-advisory
RHSA-2026:93465vendor-advisory
RHSA-2026:93466vendor-advisory
RHSA-2026:93583vendor-advisory
RHSA-2026:93716vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-102556vdb-entry
RHBZ#2543229issue-tracking

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