3.7
Low
CVE-2026-54478 In NLnet Labs Unbound 1.18.0 up to and including 1.25.1, when Unbound listens on a 'proxy-protocol-port' interface…
Description
In NLnet Labs Unbound 1.18.0 up to and including 1.25.1, when Unbound listens on a 'proxy-protocol-port' interface with 'answer-cookie: yes', the RFC 9018 server-cookie SipHash is computed over the proxy's wire address instead of the PROXYv2-declared client. One server cookie obtained through a given proxy node therefore validates for every PROXYv2-declared source behind that node. On a UDP+proxy-protocol front, an off-path attacker can harvest one cookie with a single legitimate query, then replay it under any spoofed source and pass DNS Cookie checks that were deployed to defeat this in the first place.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| unbound 1.18 | 1.18.0 → < 1.25.2 | 1.25.2 |
References
- www.nlnetlabs.nl www.nlnetlabs.nl
Timeline
- Published
- Last modified
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