Bug 2441242 (CVE-2026-26967)

Summary: CVE-2026-26967 pjsip: PJSIP: Arbitrary code execution via H.264 unpacketizer heap-based buffer overflow
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in PJSIP. A remote attacker could exploit a heap-based buffer overflow vulnerability in the H.264 unpacketizer by sending specially crafted Secure Real-time Transport Protocol (SRTP) packets. The unpacketizer fails to validate the bounds of a 2-byte Network Abstraction Layer (NAL) unit size field, which can lead to arbitrary code execution.
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Bug Depends On: 2441255, 2441256    
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Description OSIDB Bzimport 2026-02-20 01:01:25 UTC 
PJSIP is a free and open source multimedia communication library written in C. In versions 2.16 and below, there is a critical Heap-based Buffer Overflow vulnerability in PJSIP's H.264 unpacketizer. The bug occurs when processing malformed SRTP packets, where the unpacketizer reads a 2-byte NAL unit size field without validating that both bytes are within the payload buffer bounds. The vulnerability affects applications that receive video using H.264. A patch is available at https://github.com/pjsip/pjproject/commit/f821c214e52b11bae11e4cd3c7f0864538fb5491.