CVE-2026-27851
dovecot: When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpre...
CVE-2026-27851 is fixed in 17 products on 1 platform, first by dovecot-auth-lua 1:2.4.1+dfsg1-5ubuntu4.2, released May 12, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
Urgent
CVSS
9.1
critical
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0041
35th percentile
When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped. This can enable SQL / LDAP injection attacks when used in authentication. Avoid using safe filter until on fixed version. No publicly available exploits are known.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| dovecot · Debian 13.5 (trixie) | 1:2.4.1+dfsg1-6+deb13u6 | DEBIAN-CVE-2026-27851 | May 27, 2026 |
| dovecot · Debian 14 | 1:2.4.4+dfsg1-1 | DEBIAN-CVE-2026-27851 | May 27, 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 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 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 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 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 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-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 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 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 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 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 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 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 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 |
| 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 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.