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CVE-2026-54478 is a low-severity flaw in NLnet Labs Unbound affecting versions 1.18.0 through 1.25.1. When Unbound is configured to listen on a proxy-protocol interface and DNS Cookies are enabled with answer-cookie, the RFC 9018 server-cookie SipHash is computed using the proxy node’s wire address rather than the client address declared in the PROXYv2 metadata. As a result, a server cookie obtained through a given proxy becomes valid for any client source address asserted behind that same proxy. This breaks the intended source-binding property of DNS Cookies in proxy-protocol deployments.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.