CVE-2026-26203

MEDIUM
2026-02-19 [email protected]
6.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 22:03 vuln.today
Patch Released
Feb 20, 2026 - 20:12 nvd
Patch available
CVE Published
Feb 19, 2026 - 20:25 nvd
MEDIUM 6.5

Tags

Use After Free Pjsip

Description

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.

Analysis

PJSIP versions before 2.17 contain a use-after-free vulnerability in the H.264 packetizer that allows local attackers with user privileges to cause denial of service through malformed H.264 bitstreams lacking proper NAL unit markers. The flaw stems from inadequate pointer validation during packet processing, enabling out-of-bounds memory access that crashes the application. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.

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Priority Score

33
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +32
POC: 0

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CVE-2026-26203 vulnerability details – vuln.today
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