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CVE-2026-85501, also called ReTrap, affects NLnet Labs Unbound through version 1.26.0. Malicious DNS zones or crafted DNS responses can induce excessive DNSSEC-validation work, degrading resolver availability. The issue encompasses TagTrap, in which numerous mismatched DNSKEY, RRSIG, and DS records stress Zone/Algorithm/KeyTag matching; DelegationTrap, in which deeply nested delegations impose expensive iterative DNSKEY and DS chain-of-trust validation; NsecTrap, in which excessive invalid NSEC records require repeated validation; and AdditionalTrap, in which DNSSEC validation of records in the ADDITIONAL section consumes validation resources.
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A medium-severity Unbound service-degradation vulnerability caused by malicious DNS zones using ReTrap algorithmic-complexity attacks, including TagTrap, DelegationTrap, NsecTrap, and AdditionalTrap.
Retrap is a DNSSEC algorithmic-complexity vulnerability that can be used to launch resource-exhaustion attacks.
A vulnerability identified as Retrap that permits algorithmic-complexity attacks against Unbound DNSSEC processing.
A Retrap algorithmic-complexity vulnerability in Unbound's DNSSEC processing, potentially enabling resource-exhaustion attacks.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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