CVE-2026-57191
Asterisk: Stack buffer overflow in MWI NOTIFY Message-Account parsing
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Timeline
ID reserved
By GitHub_M
- 4 months later
· 4 months later
Published
- 6 days later
· 6 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 4.0 | High8.2 | 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 |
| NVDNVD · Undergoing Analysis | 4.0 | High8.2 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.59% · top 51% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.2.
Weakness
Affected products
- affected < 20.20.1
- affected >= 21.0.0-pre1, < 21.12.3
- affected >= 22.0.0-pre1, < 22.10.1
- affected >= 23.0.0-pre1, < 23.4.1
- affected < 20.7-cert11
- affected >= 22.8-cert1-pre1, < 22.8-cert3
References (15)
- https://github.com/asterisk/asterisk/security/advisories/GHSA-589g-qgf8-m6mx (opens in a new tab)x_refsource_CONFIRM
- https://github.com/asterisk/asterisk/commit/0e89514084490070c5ecee419ec5ee37b7c49528 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/647b35c3cfd4a2cc3b1fb7560b085feba5c24b4b (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/7a1ffcdf38cc76d1c4eae51651667f3fd4548ab0 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/b4be3bd67ce4ac35b94fbfa860cdd9e1c906610b (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/b5281828dad7d44658439ba6393fe6be3328a4bd (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/dca516f6d895e8867d48fa56b6ce7f05b6f7457a (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/commit/ee1b66a5e40733ba0b9fad7fc4d032cabbe1dd75 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/20.20.1 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/21.12.3 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/22.10.1 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/23.4.1 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3 (opens in a new tab)x_refsource_MISC
- https://github.com/asterisk/asterisk/tree/24.0.0-pre1 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-57191)Record last updated .