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CVE-2026-57191 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

No CVSS 3.x data is available for this CVE.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/asterisk/asterisk/commit/0e89514084490070c5ecee419ec5ee37b7c49528	[email protected]
https://github.com/asterisk/asterisk/commit/647b35c3cfd4a2cc3b1fb7560b085feba5c24b4b	[email protected]
https://github.com/asterisk/asterisk/commit/7a1ffcdf38cc76d1c4eae51651667f3fd4548ab0	[email protected]
https://github.com/asterisk/asterisk/commit/b4be3bd67ce4ac35b94fbfa860cdd9e1c906610b	[email protected]
https://github.com/asterisk/asterisk/commit/b5281828dad7d44658439ba6393fe6be3328a4bd	[email protected]
https://github.com/asterisk/asterisk/commit/dca516f6d895e8867d48fa56b6ce7f05b6f7457a	[email protected]
https://github.com/asterisk/asterisk/commit/ee1b66a5e40733ba0b9fad7fc4d032cabbe1dd75	[email protected]
https://github.com/asterisk/asterisk/releases/tag/20.20.1	[email protected]
https://github.com/asterisk/asterisk/releases/tag/21.12.3	[email protected]
https://github.com/asterisk/asterisk/releases/tag/22.10.1	[email protected]
https://github.com/asterisk/asterisk/releases/tag/23.4.1	[email protected]
https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11	[email protected]
https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3	[email protected]
https://github.com/asterisk/asterisk/security/advisories/GHSA-589g-qgf8-m6mx	[email protected]
https://github.com/asterisk/asterisk/tree/24.0.0-pre1	[email protected]

see all 15 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-120	Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')	[email protected]
CWE-787	Out-of-bounds Write	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Nov 2, 2026	CVE Modified	CISA-ADP
Oct 27, 2026	New CVE Received	[email protected]