CVE-2026-27859

dovecot: Dovecot: Denial of Service via excessive RFC 2231 MIME parameters

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Severity

Moderate

Red Hat Product Security

5.3

CVSS 3.1

Review impact separately from score.

Published · March 27, 2026

Updated · June 30, 2026

Description

A flaw was found in Dovecot. A remote attacker can exploit this vulnerability by sending a specially crafted mail message containing an excessive amount of RFC 2231 MIME parameters. This can cause the Local Mail Transfer Protocol (LMTP) process to consume large amounts of CPU time, leading to a Denial of Service (DoS).

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE-770 · Allocation of Resources Without Limits or Throttling