Answer in brief
CVE-2026-57191 records a High severity (CVSS 8.2) vulnerability in Asterisk: Stack buffer overflow in MWI NOTIFY Message-Account parsing. The current sources do not mark it as known exploited. The current feed maps asterisk/asterisk (generic), asterisk/certified-asterisk (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps asterisk/asterisk (generic), asterisk/certified-asterisk (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| asterisk/asteriskgeneric | <20.20.1 || >=21.0.0-pre1 <21.12.3 || >=22.0.0-pre1 <22.10.1 || >=23.0.0-pre1 <23.4.1 | 20.20.1, 21.12.3, 22.10.1, 23.4.1 |
| asterisk/certified-asteriskgeneric | <20.7-cert11 || >=22.8-cert1-pre1 <22.8-cert3 | 20.7-cert11, 22.8-cert3 |
Published upstream
Oct 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 28, 2026
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.
Quoted source text, attributed separately from HOL analysis.