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CVE-2026-42944 is a heap-based buffer overflow vulnerability in NLnet Labs Unbound affecting versions 1.14.0 through 1.25.0 inclusive. The flaw occurs while encoding reply packets that contain multiple EDNS options related to NSID, DNS Cookie, and EDNS Padding. Exploitation requires the relevant features to be enabled, specifically NSID, answer-cookie, and pad-responses, with pad-responses enabled by default. An attacker able to send queries to the resolver can supply multiple instances of these EDNS options in a query. Due to a flaw in EDNS field size calculation that truncates the correct value, combined with insufficient handling of duplicate options, the encoder can write past the allocated heap buffer while constructing the response. This results in a heap overflow write of Unbound-controlled data and can terminate the resolver process.
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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.
15 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.
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.