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CVE-2026-77860 is an incorrect counter-management flaw in NLnet Labs Unbound 1.20.0 through 1.26.0. On the serve-expired code path, Unbound double-decrements the per-client wait-limit counter. An attacker controlling an authoritative zone with short-TTL records can alternate unanswered queries with queries for expired cached names. The expired-name queries are answered through serve-expired and act as pumps that reduce the counter twice, allowing the attacker to evade the per-client pending-query restriction introduced as a DNSBomb countermeasure.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A low-severity Unbound issue in the serve-expired code path that bypasses a DNSBomb countermeasure and could contribute to a pulsing denial-of-service amplification attack.
A flaw in which Unbound's serve-expired behavior can bypass its wait-limit control.
A flaw through which Unbound's serve-expired behavior can bypass the wait-limit control.
An Unbound flaw where the serve-expired feature can bypass the wait-limit control.
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.