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CVE-2026-77955 is a timing flaw in NLnet Labs Unbound affecting versions 1.13.2 through 1.26.0. For configured authoritative zones with zonemd-check enabled that are beneath, but are not themselves, a trust anchor, Unbound can serve zone contents before ZONEMD integrity verification completes. The verification is delayed while asynchronous DS and DNSKEY resolution occurs, creating a time-of-check/time-of-use window. If zone-file persistence is enabled, data received before a failed verification can be written to disk; it is then reloaded following a restart and remains available until verification subsequently completes and fails.
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No public exploit code observed for this vulnerability.
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7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A medium-severity Unbound issue affecting versions 1.13.2 through 1.26.0 when ZONEMD checking is enabled for zones beneath a trust anchor. It can cause denial of service and temporarily permit serving tampered zone data before ZONEMD validation.
A potential bypass condition affecting ZONEMD verification.
A possible verification-bypass window affecting Unbound ZONEMD validation.
A potential Unbound ZONEMD verification-bypass condition.
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.