Incorrect Implementation of Authentication Algorithm Affecting unbound-dracut package, versions *


Severity

Recommended
0.0
low
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.17% (7th percentile)

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  • Snyk IDSNYK-RHEL10-UNBOUNDDRACUT-18339557
  • published28 Jul 2026
  • disclosed22 Jul 2026

Introduced: 22 Jul 2026

NewCVE-2026-54478  (opens in a new tab)
CWE-303  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:10 unbound-dracut.

NVD Description

Note: Versions mentioned in the description apply only to the upstream unbound-dracut package and not the unbound-dracut package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1