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CVE-2026-33278 is a use-after-free vulnerability in the NLnet Labs Unbound DNSSEC validator affecting versions 1.19.1 through 1.25.0. When validation of a DS sub-query is suspended after exhaustion of the NSEC3 computational budget, the validator deep-copies response state to survive teardown of the sub-query memory region. A faulty structure assignment overwrites a destination pointer with a pointer into the source region. Once that region is freed, resumed validation dereferences the dangling pointer. The resulting memory-safety condition can crash the resolver and may permit remote code execution.
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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.
40 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A separate critical Unbound validator vulnerability fixed in Unbound 1.25.1. It is mentioned only to distinguish it from CVE-2026-81642.
A DNSSEC-validator memory-safety flaw in Unbound 1.19.1 through 1.25.0. A malicious signed zone can trigger NSEC3 computational-budget exhaustion and a faulty deep copy that leaves a dangling pointer, causing a crash and potentially remote code execution.
A critical F5 BIG-IP vulnerability affecting BIG-IP Domain Name System and BIG-IP Global Traffic Manager components. The supplied CVSS vectors indicate an unauthenticated, network-reachable vulnerability with high impact to confidentiality, integrity, and availability.
Unknown
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.