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CVE-2026-44690 is a cache poisoning vulnerability in NLnet Labs Unbound affecting versions 1.7.0 through 1.25.1. The flaw arises from insufficient validation of the DNSSEC RRSIG Labels field together with premature cache writes during RFC 8198 aggressive NSEC processing. Under these conditions, Unbound can incorrectly accept and cache maliciously crafted insecure wildcard delegation data derived from a zone controlled by an attacker. A malicious actor who controls a single delegated domain beneath an NSEC-signed parent can abuse fraudulent wildcard DS records with fewer labels than expected and an unknown algorithm to cause nonexistent sibling delegations covered by the parent NSEC chain to be treated as insecurely existing. This enables cross-zone poisoning of arbitrary sibling zones under the same parent domain.
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What an attacker gets, and what they’ve been doing with it.
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No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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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.