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8.1
PJSIP H.264 Video Processing Can Overwrite Memory
CVE-2026-26967
Summary
If an attacker sends malicious video data, it could potentially cause a critical security issue. This affects applications that use PJSIP to play H.264 video. A fix is available, and users should update to the latest version.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| pjsip | pjsip | <= 2.17 | – |
Original title
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...
Original description
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.
nvd CVSS3.1
5.3
nvd CVSS4.0
8.1
Vulnerability type
CWE-122
Heap-based Buffer Overflow
Published: 20 Feb 2026 · Updated: 11 Mar 2026 · First seen: 6 Mar 2026