CVE-2026-57191

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.

References

https://github.com/asterisk/asterisk/tree/24.0.0-pre1

https://github.com/asterisk/asterisk/security/advisories/GHSA-589g-qgf8-m6mx

https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3

https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11

https://github.com/asterisk/asterisk/releases/tag/23.4.1

https://github.com/asterisk/asterisk/releases/tag/22.10.1

https://github.com/asterisk/asterisk/releases/tag/21.12.3

https://github.com/asterisk/asterisk/releases/tag/20.20.1

https://github.com/asterisk/asterisk/commit/ee1b66a5e40733ba0b9fad7fc4d032cabbe1dd75

https://github.com/asterisk/asterisk/commit/dca516f6d895e8867d48fa56b6ce7f05b6f7457a

https://github.com/asterisk/asterisk/commit/b5281828dad7d44658439ba6393fe6be3328a4bd

https://github.com/asterisk/asterisk/commit/b4be3bd67ce4ac35b94fbfa860cdd9e1c906610b

https://github.com/asterisk/asterisk/commit/7a1ffcdf38cc76d1c4eae51651667f3fd4548ab0

https://github.com/asterisk/asterisk/commit/647b35c3cfd4a2cc3b1fb7560b085feba5c24b4b

https://github.com/asterisk/asterisk/commit/0e89514084490070c5ecee419ec5ee37b7c49528

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-111397

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS