CVE-2026-42004 · cross-distro fix matrix

CVE-2026-42004: An attacker can send a crafted EDNS OPT record that will be ignored by DNSdist’s filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted, causing the backend to see the EDNS option(s) that DNSdist did not filter.

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

Fix per ecosystem

Each block below is a distro release where CVE-2026-42004 has a known fix. Run the listed command on that distro to remediate.

Debian trixie

Source: Debian Security Tracker

dnsdist→ fixed in1.9.15-0+deb13u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y dnsdist
```

Alpine edge

Source: Alpine secdb

dnsdist→ fixed in2.0.7-r0
```
apk update && apk add --upgrade dnsdist
```

Are YOU affected by CVE-2026-42004?

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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