CVEvulnerability

CVE-2026-40016

6.5 MEDIUM Published 2026-05-12 Modified 2026-10-26 Official page ↗
Status
Analyzed
Published
2026-05-12
Last modified
2026-10-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.3 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-400

Description

Attacker can upload a malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU time limits for Sieve up to 130 times of the configured limit. Attacker can use this to degrade server performance and bypass configured CPU time limits for Sieve scripts. Install fixed version, or alternatively prevent direct access to Sieve scripts via ManageSieve or local access. No publicly available exploits are known.

Affected configurations

• dovecot dovecot (< 2.4.4) • open-xchange dovecot (< 3.1.5)

Related

Weakness · CWE (1)

  • CWE-400 Uncontrolled Resource Consumption weakness

References