CVE-2026-40020
dovecot: Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_...
CVE-2026-40020 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
4.3
medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0026
17th percentile
Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed version. 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-2026-40020 | May 27, 2026 |
| dovecot · Debian 13.5 (trixie) | 1:2.4.1+dfsg1-6+deb13u6 | DEBIAN-CVE-2026-40020 | May 27, 2026 |
| dovecot · Debian 14 | 1:2.4.4+dfsg1-1 | DEBIAN-CVE-2026-40020 | 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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