CVE-2025-12105: Libsoup: heap use-after-free in libsoup message queue handling during http/2 read completion

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-23 · updated 2026-10-18
Weakness: CWE-416

Description

A flaw was found in the asynchronous message queue handling of the libsoup library, widely used by GNOME and WebKit-based applications to manage HTTP/2 communications. When network operations are aborted at specific timing intervals, an internal message queue item may be freed twice due to missing state synchronization. This leads to a use-after-free memory access, potentially crashing the affected application. Attackers could exploit this behavior remotely by triggering specific HTTP/2 read and cancel sequences, resulting in a denial-of-service condition.

Affected products

GNOME libsoup: through 3.6.5
Red Hat Enterprise Linux 10: all versions — fixed in 0:3.6.5-3.el10_1.7
Red Hat Enterprise Linux 10.0 Extended Update Support: all versions — fixed in 0:3.6.5-3.el10_0.10

How to fix

Upgrade to a fixed version: Red Hat Enterprise Linux 10 0:3.6.5-3.el10_1.7; Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.6.5-3.el10_0.10. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2025-12105 or the next vulnerability affects your stack