CVE-2026-27855 · cross-distro fix matrix

CVE-2026-27855: Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid. An attacker able to observe an OTP exchange is able to log in as the user. If authenti

Affects 4 Linux releases across 4 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2026-27855 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

dovecot→ fixed in1:2.3.13+dfsg1-2+deb11u3urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y dovecot
```

Debian bookworm

Source: Debian Security Tracker

dovecot→ fixed in1:2.3.19.1+dfsg1-2.1+deb12u2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y dovecot
```

Debian trixie

Source: Debian Security Tracker

dovecot→ fixed in1:2.4.1+dfsg1-6+deb13u4urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y dovecot
```

Alpine edge

Source: Alpine secdb

dovecot→ fixed in2.4.3-r0
```
apk update && apk add --upgrade dovecot
```

Are YOU affected by CVE-2026-27855?

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.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan View on NVD

Continuous monitoring beats manual checking

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