Bug 2452175 (CVE-2026-27858) - CVE-2026-27858 dovecot: denial of service via crafted message before authentication
Summary: CVE-2026-27858 dovecot: denial of service via crafted message before authenti...
Keywords:
Status: NEW
Alias: CVE-2026-27858
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2452240 2452241 2452242
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-27 09:02 UTC by OSIDB Bzimport
Modified: 2026-03-27 14:11 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-03-27 09:02:09 UTC 
Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory.
 Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known.
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