Threats Tagged 'cve-2026-54478'
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Threats Tagged 'cve-2026-54478'
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CVE-2026-54478: CWE-290: Authentication Bypass by Spoofing in NLnet Labs UnboundCVE-2026-54478 0 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. Join the discussion | CVE Database V5 | 07/22/2026, 13:09:18 UTC Added: 07/22/2026, 13:22:42 UTC |
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