Answer in brief
CVE-2026-129483 records a Critical severity (CVSS 9.3) vulnerability in Cyrus SASL through 2.1.28 SRP Authentication Bypass via plugins/srp.c. The current sources do not mark it as known exploited. The current feed maps cyrusimap/cyrus-sasl (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 9.3. 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 cyrusimap/cyrus-sasl (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| cyrusimap/cyrus-saslgeneric | >=0 <=2.1.28 | Not reported |
Published upstream
Nov 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 15, 2026
Cyrus SASL through 2.1.28 contains an authentication bypass vulnerability in the SRP server mechanism because srp_server_mech_step2 does not reject client public values A that are multiples of N. Unauthenticated network clients can send A equal to N to force a zero shared secret, authenticating as any existing user without the password and learning session keys.
Quoted source text, attributed separately from HOL analysis.