---
id: CVE-2026-57160
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 commit d6a0e7f, a buffer overflow can occur in
  pjsip_generic_array_hdr_print() in pjsip/src/pjsip/sip_msg.c, the function
  that serializes generic arr…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-193
vendor: teluu
product: pjsip
affected:
  - pjsip <= 2.17
published: '2026-09-04'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T15:31:44.923'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-57160'
references:
  - url: >-
      https://github.com/pjsip/pjproject/commit/d6a0e7f76611c3a6f530ee051e3e7a622bb1748c
    label: security-advisories@github.com
  - url: 'https://github.com/pjsip/pjproject/security/advisories/GHSA-277r-3q2j-mxcw'
    label: security-advisories@github.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-57160.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-57160'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-57160'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00412
epssPercentile: 0.32747
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-08T16:50:27.194449Z'
scores:
  nvd: 5.3
  cna: 6.9
  vendor: 7.5
ingestedAt: '2026-09-08T18:07:34.888Z'
---

## Overview

PJSIP is a free and open source multimedia communication library written in C. Prior to commit d6a0e7f, a buffer overflow can occur in pjsip_generic_array_hdr_print() in pjsip/src/pjsip/sip_msg.c, the function that serializes generic array headers (such as Allow, Require, Supported, and Unsupported). Under certain output-buffer boundary conditions the function can write one byte past the end of the buffer. This is reachable mainly in applications that parse and re-serialize incoming SIP requests — for example a proxy, SBC, or B2BUA — where a remote peer can influence the serialized message. The out-of-bounds write is a single fixed byte; code execution and information disclosure are not demonstrated, and in typical pool-based allocations the byte falls within allocation slack. This issue has been patched via commit d6a0e7f.

## Affected

- `pjsip <= 2.17`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-57160.json)