CVE-2026-27851 · cross-distro fix matrix

CVE-2026-27851: It was discovered that Dovecot incorrectly treated some variable expansion

Affects 3 Linux releases across 50 (distro × package) combinations. First disclosed: 2026-05-12.

CVSS v3:HIGH · 7.4(NVD-published)

Fix per ecosystem

Each block below is a distro release where CVE-2026-27851 has a known fix. Run the listed command on that distro to remediate.

Ubuntu jammy

Source: Ubuntu USN

dovecot→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot
```
dovecot-auth-lua→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-auth-lua
```
dovecot-core→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-core
```
dovecot-dev→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-dev
```
dovecot-gssapi→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-gssapi
```
dovecot-imapd→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-imapd
```
dovecot-ldap→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-ldap
```
dovecot-lmtpd→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-lmtpd
```
dovecot-lucene→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-lucene
```
dovecot-managesieved→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-managesieved
```
dovecot-mysql→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-mysql
```
dovecot-pgsql→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-pgsql
```
dovecot-pop3d→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-pop3d
```
dovecot-sieve→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-sieve
```
dovecot-solr→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-solr
```
dovecot-sqlite→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-sqlite
```
dovecot-submissiond→ fixed in1:2.3.16+dfsg1-3ubuntu2.9USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-submissiond
```

Ubuntu noble

Source: Ubuntu USN

dovecot→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot
```
dovecot-auth-lua→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-auth-lua
```
dovecot-core→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-core
```
dovecot-dev→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-dev
```
dovecot-gssapi→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-gssapi
```
dovecot-imapd→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-imapd
```
dovecot-ldap→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-ldap
```
dovecot-lmtpd→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-lmtpd
```
dovecot-managesieved→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-managesieved
```
dovecot-mysql→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-mysql
```
dovecot-pgsql→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-pgsql
```
dovecot-pop3d→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-pop3d
```
dovecot-sieve→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-sieve
```
dovecot-solr→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-solr
```
dovecot-sqlite→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-sqlite
```
dovecot-submissiond→ fixed in1:2.3.21+dfsg1-2ubuntu6.5USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-submissiond
```

Ubuntu questing

Source: Ubuntu USN

dovecot→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot
```
dovecot-auth-lua→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-auth-lua
```
dovecot-core→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-core
```
dovecot-dev→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-dev
```
dovecot-flatcurve→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-flatcurve
```
dovecot-gssapi→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-gssapi
```
dovecot-imapd→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-imapd
```
dovecot-ldap→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-ldap
```
dovecot-lmtpd→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-lmtpd
```
dovecot-managesieved→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-managesieved
```
dovecot-mysql→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-mysql
```
dovecot-pgsql→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-pgsql
```
dovecot-pop3d→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-pop3d
```
dovecot-sieve→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-sieve
```
dovecot-solr→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-solr
```
dovecot-sqlite→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-sqlite
```
dovecot-submissiond→ fixed in1:2.4.1+dfsg1-5ubuntu4.2USN-8365-1
```
sudo apt-get install --only-upgrade -y dovecot-submissiond
```

Are YOU affected by CVE-2026-27851?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

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