CVE-2025-40777 · cross-distro fix matrix

CVE-2025-40777: If a `named` caching resolver is configured with `serve-stale-enable` `yes`, and with `stale-answer-client-timeout` set to `0` (the only allowable value other than `disabled`), and if the resolver, in the process of resolving a query, encounters a CNAME chain involving a specific combination of cach

Affects 2 Linux releases across 2 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2025-40777 has a known fix. Run the listed command on that distro to remediate.

Debian trixie

Source: Debian Security Tracker

bind9→ fixed in1:9.20.11-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y bind9
```

Alpine edge

Source: Alpine secdb

bind→ fixed in9.20.11-r0
```
apk update && apk add --upgrade bind
```

Are YOU affected by CVE-2025-40777?

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

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