CVE-2026-26203CWE-416

PJSIP's pjmedia-video has use-after-free in H264 packetizer when packetizing fragmented NAL

Medium · published February 19, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
5.7
In the wild
Unconfirmed
What it is

PJSIP is a free and open source multimedia communication library. Versions prior to 2.17 have a critical heap buffer underflow vulnerability in PJSIP's H.264 packetizer. The bug occurs when processing malformed H.264 bitstreams without NAL unit start codes, where the packetizer performs unchecked pointer arithmetic that can read from memory located before the allocated buffer. Version 2.17 contains a patch for the issue.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L
EPSS
0.00168 · 5.7th percentile
Weakness
CWE-416 · Use After Free
Published
2026-02-19T19:28Z
EPSS history
Timeline
  • 19 FEB 19:28Z
    PJSIP's pjmedia-video has use-after-free in H264 packetizer when packetizing fragmented NAL
    cvelistv5