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CVE-2026-33278 is a critical memory-safety vulnerability in the DNSSEC validator of NLnet Labs Unbound affecting versions 1.19.1 through 1.25.0. The flaw occurs in logic that preserves response messages across memory region teardown when DS sub-queries suspend validation because the NSEC3 computational budget is exhausted. During this path, Unbound performs a deep copy of a data structure, but a struct-assignment bug incorrectly overwrites a destination pointer with the source pointer instead of preserving the copied destination reference. When the sub-query memory region is later freed and validation resumes, the validator dereferences a dangling pointer. This results in a use-after-free condition that can crash the resolver and may be exploitable for remote code execution. The issue was introduced with the NSEC3 computational budget exhaustion handling added in Unbound 1.19.1 and was fixed in Unbound 1.25.1 by preserving the correct pointer during the deep-copy operation.
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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.
28 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability addressed by cPanel in the cpanel-unbound 1.25.1 security release.
A vulnerability in the DNSSEC validator of NLnet Labs Unbound that can cause denial of service and potentially remote code execution due to a deep-copy struct-assignment bug leading to a dangling pointer dereference.
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.