---
id: CVE-2026-57187
title: >-
  Asterisk: Heap-use-after-free in Asterisk PJSIP TCP/SDP handling when TCP
  connection closes during SDP processing
summary: >-
  Asterisk is an open source private branch exchange and telephony toolkit.
  Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk
  20.7-cert11, 22.8-cert3, an authenticated attacker may cause a
  heap-use-after-free in `P…
severity: high
cvss: 7.1
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-416
  - CWE-664
vendor: asterisk
product: asterisk
affected:
  - asterisk < 20.20.1
  - 'asterisk >= 21.0.0-pre1, < 21.12.3'
  - 'asterisk >= 22.0.0-pre1, < 22.10.1'
  - 'asterisk >= 23.0.0-pre1, < 23.4.1'
  - certified-asterisk < 20.7-cert11
  - 'certified-asterisk >= 22.8-cert1-pre1, < 22.8-cert3'
published: '2026-10-26'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T19:31:52.937Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-57187'
references:
  - url: >-
      https://github.com/asterisk/asterisk/security/advisories/GHSA-g8q2-p36q-94f6
    label: >-
      https://github.com/asterisk/asterisk/security/advisories/GHSA-g8q2-p36q-94f6
  - url: >-
      https://github.com/asterisk/asterisk/commit/0f076168e0be31ebee37762192d0ee049e9c0d42
    label: >-
      https://github.com/asterisk/asterisk/commit/0f076168e0be31ebee37762192d0ee049e9c0d42
  - url: >-
      https://github.com/asterisk/asterisk/commit/27b9544b32f059a4f614169243eaa7559f622aa0
    label: >-
      https://github.com/asterisk/asterisk/commit/27b9544b32f059a4f614169243eaa7559f622aa0
  - url: >-
      https://github.com/asterisk/asterisk/commit/6e1f4df744369d66ea6f412e355d819b2a7bf26c
    label: >-
      https://github.com/asterisk/asterisk/commit/6e1f4df744369d66ea6f412e355d819b2a7bf26c
  - url: >-
      https://github.com/asterisk/asterisk/commit/9e0386c6d259f0c7499d52499d9891bee8a494fa
    label: >-
      https://github.com/asterisk/asterisk/commit/9e0386c6d259f0c7499d52499d9891bee8a494fa
  - url: >-
      https://github.com/asterisk/asterisk/commit/b7ba85458796ef54b471017287c7806095dbda76
    label: >-
      https://github.com/asterisk/asterisk/commit/b7ba85458796ef54b471017287c7806095dbda76
  - url: >-
      https://github.com/asterisk/asterisk/commit/d4e30005940f86942745bcc64f34748d69870247
    label: >-
      https://github.com/asterisk/asterisk/commit/d4e30005940f86942745bcc64f34748d69870247
  - url: >-
      https://github.com/asterisk/asterisk/commit/f1e47621472bb3d8ad71f32823f5ca986e008437
    label: >-
      https://github.com/asterisk/asterisk/commit/f1e47621472bb3d8ad71f32823f5ca986e008437
  - url: 'https://github.com/asterisk/asterisk/releases/tag/20.20.1'
    label: 'https://github.com/asterisk/asterisk/releases/tag/20.20.1'
  - url: 'https://github.com/asterisk/asterisk/releases/tag/21.12.3'
    label: 'https://github.com/asterisk/asterisk/releases/tag/21.12.3'
  - url: 'https://github.com/asterisk/asterisk/releases/tag/22.10.1'
    label: 'https://github.com/asterisk/asterisk/releases/tag/22.10.1'
  - url: 'https://github.com/asterisk/asterisk/releases/tag/23.4.1'
    label: 'https://github.com/asterisk/asterisk/releases/tag/23.4.1'
  - url: 'https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11'
    label: 'https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11'
  - url: 'https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3'
    label: 'https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3'
  - url: 'https://github.com/asterisk/asterisk/tree/24.0.0-pre1'
    label: 'https://github.com/asterisk/asterisk/tree/24.0.0-pre1'
tags:
  - cve.org
ingestedAt: '2026-10-26T20:39:42.652Z'
epss: 0.00481
epssPercentile: 0.41315
---

## Overview

Asterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, an authenticated attacker may cause a heap-use-after-free in `PJSIP TCP/SDP` handling by sending a `SIP INVITE` over a connection-oriented transport and disconnecting before Asterisk responds with the `200 OK`. So far, the crash has only been reproduced when Asterisk is built with `Address Sanitizer`, which detects the issue. `Address Sanitizer` is a development tool with significant performance overhead and, according to the maintainer, is not used in production systems. This issue is fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3.

## Affected

- `asterisk < 20.20.1`
- `asterisk >= 21.0.0-pre1, < 21.12.3`
- `asterisk >= 22.0.0-pre1, < 22.10.1`
- `asterisk >= 23.0.0-pre1, < 23.4.1`
- `certified-asterisk < 20.7-cert11`
- `certified-asterisk >= 22.8-cert1-pre1, < 22.8-cert3`

## Remediation

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