---
id: CVE-2026-77396
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.
  In 2.17 and earlier, the PJSIP AVI parser in pjmedia/src/pjmedia/avi_player.c
  uses an input-file video chunk length as the number of bytes copied into a
  frame…
severity: medium
cvss: 6.9
cvssVector: 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-122
  - CWE-787
vendor: pjsip
product: pjproject
affected:
  - pjproject <= 2.17
published: '2026-09-18'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T21:17:10.010'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77396'
references:
  - url: >-
      https://github.com/pjsip/pjproject/commit/7ecc6584969a923c4190b6912afbf5952b5a4b9f
    label: security-advisories@github.com
  - url: 'https://github.com/pjsip/pjproject/security/advisories/GHSA-6p2p-5wf8-h5hr'
    label: security-advisories@github.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77396.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-77396'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-77396'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-18T19:24:42.044700Z'
cvssSource: cna
epss: 0.00128
epssPercentile: 0.02836
ingestedAt: '2026-09-18T17:46:41.552Z'
scores:
  cna: 6.9
  vendor: 7.1
---

## Overview

PJSIP is a free and open source multimedia communication library written in C. In 2.17 and earlier, the PJSIP AVI parser in pjmedia/src/pjmedia/avi_player.c uses an input-file video chunk length as the number of bytes copied into a frame buffer whose capacity is derived from the declared media dimensions. A crafted AVI file can therefore cause an attacker-controlled out-of-bounds write past the heap allocation when an application plays the file or pulls its frames. The existing size assertion does not protect production release builds, where assertions are disabled. Typical local playback can crash the process, while applications that accept untrusted AVI sources expose a stronger memory-corruption condition. No fixed version is available as of this review.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77396.json)