#VU125905 Use-after-free in pjsip - CVE-2026-26203

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Main Vulnerability Database Vulnerabilities #VU125905

#VU125905 Use-after-free in pjsip - CVE-2026-26203

Published: April 14, 2026


Vulnerability identifier: #VU125905
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-26203
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
pjsip
Software vendor:
pjsip

Description

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to use-after-free in the H.264 packetizer when processing malformed H.264 bitstreams without NAL unit start codes during packetization of fragmented NAL units. A remote attacker can send a specially crafted H.264 bitstream to cause a denial of service.

The issue affects applications sending video using H.264 with a packetization mode other than single NAL.


Remediation

Install security update from vendor's website.

External links