GLSA 202507-06: openh264: Heap Overflow

http://security.gentoo.org/

Severity:	high
Title:	openh264: Heap Overflow
Date:	07/08/2025
Bugs:	#950112
ID:	202507-06

Synopsis

A heap overflow has been discovered in openh264, which can lead to arbitrary code execution.

Background

OpenH264 is a codec library which supports H.264 encoding and decoding. It is suitable for use in real time applications such as WebRTC.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
media-libs/openh264	< 2.6.0	>= 2.6.0	All supported architectures

Description

A vulnerability has been discovered in openh264. Please review the CVE identifiers referenced below for details.

Impact

A vulnerability in the decoding functions of OpenH264 codec library could allow a remote, unauthenticated attacker to trigger a heap overflow. This vulnerability is due to a race condition between a Sequence Parameter Set (SPS) memory allocation and a subsequent non Instantaneous Decoder Refresh (non-IDR) Network Abstraction Layer (NAL) unit memory usage. An attacker could exploit this vulnerability by crafting a malicious bitstream and tricking a victim user into processing an arbitrary video containing the malicious bitstream. An exploit could allow the attacker to cause an unexpected crash in the victim's user decoding client and, possibly, perform arbitrary commands on the victim's host by abusing the heap overflow.

Workaround

There is no known workaround at this time.

Resolution

All openh264 users should upgrade to the latest version:

          # emerge --sync
          # emerge --ask --oneshot --verbose ">=media-libs/openh264-2.6.0"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-202507-06.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.