CVE-2026-3591 · cross-distro fix matrix

CVE-2026-3591: A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lea

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

Fix per ecosystem

Each block below is a distro release where CVE-2026-3591 has a known fix. Run the listed command on that distro to remediate.

Debian trixie

Source: Debian Security Tracker

bind9→ fixed in1:9.20.21-1~deb13u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y bind9
```

Alpine edge

Source: Alpine secdb

bind→ fixed in9.20.21-r0
```
apk update && apk add --upgrade bind
```

Are YOU affected by CVE-2026-3591?

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

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