High 7.1Published Oct 26, 2026

CVE-2026-57187Asterisk: Heap-use-after-free in Asterisk PJSIP TCP/SDP handling when TCP connection closes during SDP processing

Updated under an hour ago (Oct 28, 2026, 9:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for asterisk

Exploited in the last 30 days

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.

CVSS: 7.1 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-416, CWE-664
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 26, 2026
First seen by InfoSec Signals: Oct 26, 2026

Affected products

Affected products

asterisk asterisk asterisk:asterisk (from the name)	before 20.20.1; from 21.0.0-pre1, < 21.12.3; from 22.0.0-pre1, < 22.10.1; from 23.0.0-pre1, < 23.4.1	CNA record
asterisk certified-asterisk asterisk:certified_asterisk (from the name)	before 20.7-cert11; from 22.8-cert1-pre1, < 22.8-cert3	CNA record

References

References

https://github.com/asterisk/asterisk/security/advisories/GHSA-g8q2-p36q-94f6	x-refsource-confirm
https://github.com/asterisk/asterisk/commit/0f076168e0be31ebee37762192d0ee049e9c0d42	x-refsource-misc
https://github.com/asterisk/asterisk/commit/27b9544b32f059a4f614169243eaa7559f622aa0	x-refsource-misc
https://github.com/asterisk/asterisk/commit/6e1f4df744369d66ea6f412e355d819b2a7bf26c	x-refsource-misc
https://github.com/asterisk/asterisk/commit/9e0386c6d259f0c7499d52499d9891bee8a494fa	x-refsource-misc
https://github.com/asterisk/asterisk/commit/b7ba85458796ef54b471017287c7806095dbda76	x-refsource-misc
https://github.com/asterisk/asterisk/commit/d4e30005940f86942745bcc64f34748d69870247	x-refsource-misc
https://github.com/asterisk/asterisk/commit/f1e47621472bb3d8ad71f32823f5ca986e008437	x-refsource-misc
https://github.com/asterisk/asterisk/releases/tag/20.20.1	x-refsource-misc
https://github.com/asterisk/asterisk/releases/tag/21.12.3	x-refsource-misc
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.