CVE-2026-27859
MEDIUM
MEDIUM
Priority: 0.02
BB Relevance:
71/100
Published: 2026-03-27
Modified: 2026-10-26
First seen: 2026-10-29
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
Unchanged
C:
None
I:
None
A:
Low
Description
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.
Weakness Classification (1)
Affected Software (2)
| Vendor | Product | Version |
|---|---|---|
| dovecot | dovecot | < 2.4.3 |
| open-xchange | dovecot | < 3.0.5 |
References & Advisories (1)
Vendor Advisory