Bug 2452178 (CVE-2025-59028) - CVE-2025-59028 dovecot: Dovecot: Denial of Service via invalid SASL data
Summary: CVE-2025-59028 dovecot: Dovecot: Denial of Service via invalid SASL data
Keywords:
Status: NEW
Alias: CVE-2025-59028
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-27 09:02 UTC by OSIDB Bzimport
Modified: 2026-03-27 15:03 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-03-27 09:02:18 UTC 
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.
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