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CVE-2026-3104 is a remotely triggerable denial-of-service vulnerability in BIND 9 resolvers caused by a memory leak in the code that prepares DNSSEC proofs of non-existence for caching. The flaw is in the cache database logic, specifically in addnoqname() and addclosest() in lib/dns/qpcache.c, with the same pattern also reported in the older RBT-based cache backend. When processing DNSSEC proof data, an allocation created for an NSEC rdataset can remain unreleased if construction of the corresponding RRSIG rdataset fails on an error path. In addition, the caller can leak associated cache header state when addnoqname() fails. Repeated triggering through recursive queries causes unbounded memory growth in the resolver. The issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9.18.x and 9.18.11-S1 through 9.18.46-S1 are reported as not affected.
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A memory leak vulnerability in ISC BIND 9 affecting code that prepares DNSSEC proofs of non-existence.
A remote denial-of-service memory leak vulnerability in BIND 9's cache database code for preparing DNSSEC proofs of non-existence. Triggered via recursive DNS queries to attacker-controlled DNSSEC-signed wildcard zones, it can cause unbounded memory growth and assertion-based process crashes.
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Cross-references every affected SKU, including bundled OEM variants.
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