High 8.2Published Oct 27, 2026

CVE-2026-57191Asterisk: Stack buffer overflow in MWI NOTIFY Message-Account parsing

Updated under an hour ago (Oct 28, 2026, 1:40 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 unbounded `sscanf` in `res_pjsip_pubsub` when parsing the `MWI NOTIFY` `Message-Account` field may allow an unauthenticated attacker to send a carefully crafted packet that causes a stack buffer overflow and corrupts the underlying transport, permanently disabling all SIP functionality. An Asterisk restart is required to restore full operation. 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: 8.2 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-120, CWE-787
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 27, 2026
First seen by InfoSec Signals: Oct 27, 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-589g-qgf8-m6mx	x-refsource-confirm
https://github.com/asterisk/asterisk/commit/0e89514084490070c5ecee419ec5ee37b7c49528	x-refsource-misc
https://github.com/asterisk/asterisk/commit/647b35c3cfd4a2cc3b1fb7560b085feba5c24b4b	x-refsource-misc
https://github.com/asterisk/asterisk/commit/7a1ffcdf38cc76d1c4eae51651667f3fd4548ab0	x-refsource-misc
https://github.com/asterisk/asterisk/commit/b4be3bd67ce4ac35b94fbfa860cdd9e1c906610b	x-refsource-misc
https://github.com/asterisk/asterisk/commit/b5281828dad7d44658439ba6393fe6be3328a4bd	x-refsource-misc
https://github.com/asterisk/asterisk/commit/dca516f6d895e8867d48fa56b6ce7f05b6f7457a	x-refsource-misc
https://github.com/asterisk/asterisk/commit/ee1b66a5e40733ba0b9fad7fc4d032cabbe1dd75	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.