Disclosure summary
When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail. Invalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. Install fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments). No publicly available exploits are known.
Source-reported weakness categories
CWE-20, NVD-CWE-noinfo
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2025-59028
Open original source · Updated Oct 07, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| dovecot | dovecot | * {"versionEndExcluding":"2.4.3"} |
| open-xchange | dovecot | * {"versionEndExcluding":"3.1.2"} |
Original records & references
- NIST NVD record
- CVE Program record
- documentation.open-xchange.com — Vendor Advisory
PUBLISHED 2026-03-27T05:16:18-04:00
MODIFIED 2026-10-07T05:10:00-04:00
INGESTED 2026-10-08T12:40:21-04:00