VDB-346962 · CVE-2026-26203 · GHSA-p965-mf7j-gwv8

pjsip up to 2.16 H.264 Packetizer use after free

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4.8	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical was found in pjsip up to 2.16. Affected by this vulnerability is an unknown functionality of the component H.264 Packetizer. The manipulation results in use after free. This vulnerability is reported as CVE-2026-26203. The attack requires a local approach. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in pjsip up to 2.16. Affected is an unknown function of the component H.264 Packetizer. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on availability. CVE summarizes:

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 advisory is available at github.com. This vulnerability is traded as CVE-2026-26203 since 02/11/2026. The exploitability is told to be easy. Local access is required to approach this attack. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 299760 (Linux Distros Unpatched Vulnerability : CVE-2026-26203), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.17 eliminates this vulnerability. Applying the patch 5aee54f09d4f91538d55279d7316591b28fded6c is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (299760). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

pjsip

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.8

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔒

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 299760
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-26203

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: pjsip 2.17
Patch: 5aee54f09d4f91538d55279d7316591b28fded6c

Timelineinfo

02/11/2026 CVE reserved
02/19/2026 +8 days Advisory disclosed
02/19/2026 +0 days VulDB entry created
02/23/2026 +4 days VulDB entry last update

Sourcesinfo

Advisory: GHSA-p965-mf7j-gwv8
Status: Confirmed

CVE: CVE-2026-26203 (🔒)
GCVE (CVE): GCVE-0-2026-26203
GCVE (VulDB): GCVE-100-346962

Entryinfo

Created: 02/19/2026 21:45
Updated: 02/23/2026 20:08
Changes: 02/19/2026 21:45 (69), 02/22/2026 04:25 (11), 02/23/2026 20:08 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.