Bug 2452180 (CVE-2026-27859) - CVE-2026-27859 dovecot: Dovecot: Denial of Service via excessive RFC 2231 MIME parameters
Summary: CVE-2026-27859 dovecot: Dovecot: Denial of Service via excessive RFC 2231 MIM...
Keywords:
Status: NEW
Alias: CVE-2026-27859
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 15:14 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-03-27 09:02:26 UTC 
A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the processing is limited. No publicly available exploits are known.
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