Bug 2538360 (CVE-2026-77396)

Summary:	CVE-2026-77396 pjproject: PJSIP: Memory corruption via crafted AVI file
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in PJSIP. A heap buffer overflow vulnerability exists in the AVI (Audio Video Interleave) parser. A remote attacker could exploit this by providing a specially crafted AVI file. When an application processes this file, it can lead to memory corruption, potentially allowing the attacker to execute arbitrary code or cause a denial of service by crashing the application.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2539359, 2539360, 2539357, 2539358
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Description OSIDB Bzimport 2026-09-22 18:17:12 UTC

PJSIP is a free and open source multimedia communication library written in C. In 2.17 and earlier, the PJSIP AVI parser in pjmedia/src/pjmedia/avi_player.c uses an input-file video chunk length as the number of bytes copied into a frame buffer whose capacity is derived from the declared media dimensions. A crafted AVI file can therefore cause an attacker-controlled out-of-bounds write past the heap allocation when an application plays the file or pulls its frames. The existing size assertion does not protect production release builds, where assertions are disabled. Typical local playback can crash the process, while applications that accept untrusted AVI sources expose a stronger memory-corruption condition. No fixed version is available as of this review.