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CVE-2026-44690 is a cache-poisoning vulnerability in NLnet Labs Unbound versions 1.7.0 through 1.25.1. Insufficient validation of the DNSSEC RRSIG Labels field, combined with premature cache insertion during RFC 8198 aggressive NSEC processing, permits cross-zone wildcard cache poisoning. A malicious delegated child zone can supply crafted insecure DNS data that causes Unbound to accept fraudulent wildcard DS-related data and synthesize nonexistent delegations covered by the NSEC chain of an NSEC-signed parent.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible, low-complexity vulnerability requiring no privileges or user interaction that can compromise integrity. The referenced Alibaba Cloud Linux 3 update affects Unbound-related packages.
A network-accessible vulnerability affecting Miracle Linux 9 Unbound-related packages, with CVSS v3 vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N, indicating potential high-integrity impact.
A network-accessible, low-complexity vulnerability in TencentOS Server 3 that requires no privileges or user interaction and can result in high integrity impact.
A network-accessible, low-complexity vulnerability requiring no privileges or user interaction that can compromise integrity, with no stated confidentiality or availability impact.
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.