CVE-2026-102560

Libsoup: libsoup: heap buffer overflow during outgoing permessage-deflate buffer growth

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 the permessage-deflate WebSocket extension compresses a very large outgoing message, truncated size calculations used for GByteArray growth could wrap, causing zlib to write past the allocated buffer and resulting in a heap buffer overflow.

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-125 Out-of-bounds Read

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 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
Red Hat Enterprise Linux 7Red Hat
Red Hat Enterprise Linux 8Red Hat

References

RHSA-2026:83384vendor-advisory
RHSA-2026:83618vendor-advisory
RHSA-2026:93445vendor-advisory
RHSA-2026:93446vendor-advisory
RHSA-2026:93447vendor-advisory
RHSA-2026:93583vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-102560vdb-entry
RHBZ#2543296issue-tracking

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