CVE-2026-21863 · cross-distro fix matrix

CVE-2026-21863: Valkey is a distributed key-value database. Prior to versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12, a malicious actor with access to the Valkey clusterbus port can send an invalid packet that may cause an out bound read, which might result in the system crashing. The Valkey clusterbus packet processing c

Affects 3 Linux releases across 3 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2026-21863 has a known fix. Run the listed command on that distro to remediate.

Debian trixie

Source: Debian Security Tracker

valkey→ fixed in8.1.1+dfsg1-3+deb13u2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y valkey
```

Alpine v3.21

Source: Alpine secdb

valkey→ fixed in7.2.12-r0
```
apk update && apk add --upgrade valkey
```

Alpine edge

Source: Alpine secdb

valkey→ fixed in9.0.3-r0
```
apk update && apk add --upgrade valkey
```

Are YOU affected by CVE-2026-21863?

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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