CVE-2026-40016
dovecot: Attacker can upload a malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU time limi...
CVE-2026-40016 is fixed in 19 products on 1 platform, first by dovecot-auth-lua 1:2.3.16+dfsg1-3ubuntu2.9, released May 12, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
6.5
medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0034
27th percentile
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| dovecot · Debian 12.15 (bookworm) | 1:2.3.19.1+dfsg1-2.1+deb12u6 | DEBIAN-CVE-2026-40016 | May 27, 2026 |
| dovecot · Debian 13.5 (trixie) | 1:2.4.1+dfsg1-6+deb13u6 | DEBIAN-CVE-2026-40016 | May 27, 2026 |
| dovecot · Debian 14 | 1:2.4.4+dfsg1-1 | DEBIAN-CVE-2026-40016 | May 27, 2026 |
| dovecot-auth-lua · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-auth-lua 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-auth-lua · Ubuntu 24.04.5 LTS (noble) | 1:2.3.21+dfsg1-2ubuntu6.5 | dovecot-auth-lua 1:2.3.21+dfsg1-2ubuntu6.5 | May 12, 2026 |
| dovecot-auth-lua · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-auth-lua 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-auth-lua · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-auth-lua 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot-core · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-core 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-core · Ubuntu 24.04.5 LTS (noble) | 1:2.3.21+dfsg1-2ubuntu6.5 | dovecot-core 1:2.3.21+dfsg1-2ubuntu6.5 | May 12, 2026 |
| dovecot-core · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-core 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-core · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-core 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot-flatcurve · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-flatcurve 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-flatcurve · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-flatcurve 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot-gssapi · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-gssapi 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-gssapi · Ubuntu 24.04.5 LTS (noble) | 1:2.3.21+dfsg1-2ubuntu6.5 | dovecot-gssapi 1:2.3.21+dfsg1-2ubuntu6.5 | May 12, 2026 |
| dovecot-gssapi · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-gssapi 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-gssapi · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-gssapi 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot-imapd · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-imapd 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-imapd · Ubuntu 24.04.5 LTS (noble) | 1:2.3.21+dfsg1-2ubuntu6.5 | dovecot-imapd 1:2.3.21+dfsg1-2ubuntu6.5 | May 12, 2026 |
| dovecot-imapd · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-imapd 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-imapd · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-imapd 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot-ldap · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-ldap 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-ldap · Ubuntu 24.04.5 LTS (noble) | 1:2.3.21+dfsg1-2ubuntu6.5 | dovecot-ldap 1:2.3.21+dfsg1-2ubuntu6.5 | May 12, 2026 |
| dovecot-ldap · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-ldap 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-ldap · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-ldap 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot-lmtpd · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-lmtpd 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-lmtpd · Ubuntu 24.04.5 LTS (noble) | 1:2.3.21+dfsg1-2ubuntu6.5 | dovecot-lmtpd 1:2.3.21+dfsg1-2ubuntu6.5 | May 12, 2026 |
| dovecot-lmtpd · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-lmtpd 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-lmtpd · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-lmtpd 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot-lucene · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-lucene 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-managesieved · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-managesieved 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-managesieved · Ubuntu 24.04.5 LTS (noble) | 1:2.3.21+dfsg1-2ubuntu6.5 | dovecot-managesieved 1:2.3.21+dfsg1-2ubuntu6.5 | May 12, 2026 |
| dovecot-managesieved · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-managesieved 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-managesieved · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-managesieved 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot-mysql · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-mysql 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-mysql · Ubuntu 24.04.5 LTS (noble) | 1:2.3.21+dfsg1-2ubuntu6.5 | dovecot-mysql 1:2.3.21+dfsg1-2ubuntu6.5 | May 12, 2026 |
| dovecot-mysql · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-mysql 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-mysql · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-mysql 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot-pgsql · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-pgsql 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-pgsql · Ubuntu 24.04.5 LTS (noble) | 1:2.3.21+dfsg1-2ubuntu6.5 | dovecot-pgsql 1:2.3.21+dfsg1-2ubuntu6.5 | May 12, 2026 |
| dovecot-pgsql · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-pgsql 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-pgsql · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-pgsql 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot-pop3d · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-pop3d 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-pop3d · Ubuntu 24.04.5 LTS (noble) | 1:2.3.21+dfsg1-2ubuntu6.5 | dovecot-pop3d 1:2.3.21+dfsg1-2ubuntu6.5 | May 12, 2026 |
| dovecot-pop3d · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-pop3d 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-pop3d · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-pop3d 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot-sieve · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-sieve 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-sieve · Ubuntu 24.04.5 LTS (noble) | 1:2.3.21+dfsg1-2ubuntu6.5 | dovecot-sieve 1:2.3.21+dfsg1-2ubuntu6.5 | May 12, 2026 |
| dovecot-sieve · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-sieve 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-sieve · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-sieve 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot-solr · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-solr 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-solr · Ubuntu 24.04.5 LTS (noble) | 1:2.3.21+dfsg1-2ubuntu6.5 | dovecot-solr 1:2.3.21+dfsg1-2ubuntu6.5 | May 12, 2026 |
| dovecot-solr · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-solr 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-solr · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-solr 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot-sqlite · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-sqlite 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-sqlite · Ubuntu 24.04.5 LTS (noble) | 1:2.3.21+dfsg1-2ubuntu6.5 | dovecot-sqlite 1:2.3.21+dfsg1-2ubuntu6.5 | May 12, 2026 |
| dovecot-sqlite · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-sqlite 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-sqlite · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-sqlite 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot-submissiond · Ubuntu 22.04.1 LTS (jammy) | 1:2.3.16+dfsg1-3ubuntu2.9 | dovecot-submissiond 1:2.3.16+dfsg1-3ubuntu2.9 | May 12, 2026 |
| dovecot-submissiond · Ubuntu 24.04.5 LTS (noble) | 1:2.3.21+dfsg1-2ubuntu6.5 | dovecot-submissiond 1:2.3.21+dfsg1-2ubuntu6.5 | May 12, 2026 |
| dovecot-submissiond · Ubuntu 25.10 (questing) | 1:2.4.1+dfsg1-5ubuntu4.2 | dovecot-submissiond 1:2.4.1+dfsg1-5ubuntu4.2 | May 12, 2026 |
| dovecot-submissiond · Ubuntu 26.04.1 LTS (resolute) | 1:2.4.2+dfsg1-3ubuntu2.1 | dovecot-submissiond 1:2.4.2+dfsg1-3ubuntu2.1 | May 12, 2026 |
| dovecot23 · sles 15.6 | 2.3.21.1-150200.76.1 | SUSE-SU-2026:4139-1 | Sep 14, 2026 |
| dovecot23 · sles 15.7 | 2.3.21.1-150200.76.1 | SUSE-SU-2026:4139-1 | Sep 14, 2026 |
| dovecot24 · opensuse-leap 16.0 | 2.4.4-160000.1.1 | OPENSUSE-SU-2026:21109-1 | Jun 19, 2026 |
| dovecot24 · sles 16.0 | 2.4.4-160000.1.1 | SUSE-SU-2026:22185-1 | Jun 19, 2026 |
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