---
id: CVE-2026-34235
title: PJSIP is a free and open source multimedia communication library written in C
summary: >-
  PJSIP is a free and open source multimedia communication library written in C.
  Prior to version 2.17, a heap out-of-bounds read vulnerability exists in
  PJSIP's VP9 RTP unpacketizer that occurs when parsing crafted VP9 Scalability
  Structu…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'
cwe:
  - CWE-125
vendor: teluu
product: pjsip
affected:
  - pjsip < 2.17
patched:
  - pjsip 2.17
published: '2026-03-31'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-34235'
references:
  - url: >-
      https://github.com/pjsip/pjproject/commit/f4c7d08211da1fe2ad1504434a0ad99d12aa7536
    label: security-advisories@github.com
  - url: 'https://github.com/pjsip/pjproject/security/advisories/GHSA-pqrm-53pc-wx28'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00539
epssPercentile: 0.42945
ingestedAt: '2026-07-24T20:38:02.444Z'
---

## Overview

PJSIP is a free and open source multimedia communication library written in C. Prior to version 2.17, a heap out-of-bounds read vulnerability exists in PJSIP's VP9 RTP unpacketizer that occurs when parsing crafted VP9 Scalability Structure (SS) data. Insufficient bounds checking on the payload descriptor length may cause reads beyond the allocated RTP payload buffer. This issue has been patched in version 2.17. A workaround for this issue involves disabling VP9 codec if not needed.

## Affected

- `pjsip < 2.17`

## Remediation

Upgrade past the affected range:

- `pjsip 2.17`