CVE-2026-40016
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.
- Dovecot
- < 2.4.4
- Open-xchange Dovecot
- < 3.1.5
- Fix
- Available
- CVSS 3.1
- 6.5 MEDIUM
- EPSS
- 0.3% (27th percentile)
- Weakness
- CWE-400
- NVD status
- Analyzed
- Published
- 2026-05-12
CVE-2026-40016 at NVD
No indexed exploits for CVE-2026-40016 yet
Our index is partial: it proves presence, never absence
No exploit for CVE-2026-40016 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.