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CVE-2026-101339 is a stack-based buffer overflow in NLnet Labs NSD's processing of specially formatted HIP resource records in directly supplied zone files. A HIP record whose RDATA reaches or approaches its size limit and contains an additional domain-name field identifying a HIP Rendezvous server can overwrite stack memory with up to 191 bytes of attacker-controlled data. The vulnerability is classified as a remote-code-execution-class stack overwrite. Zone files written by NSD itself, including those for secondary zones, do not use the triggering format. NSD 4.15.3 fixes the vulnerability; the complete affected-version range is not established.
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What an attacker gets, and what they’ve been doing with it.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A flaw in simdzone's dname handling that can overwrite the stack when near the RDATA limit. The update to simdzone 0.2.7 includes the fix. The content does not establish code execution, exploitation activity, or affected version ranges.
A flaw in simdzone's dname handling that can overwrite the stack when near the RDATA limit. Fixed in simdzone 0.2.7; the content does not establish whether it enables code execution.
A flaw in simdzone that can allow dname processing to overwrite the stack when near the RDATA limit. Fixed in simdzone 0.2.7.
A flaw in simdzone's dname handling that can overwrite the stack when near the RDATA limit. Fixed in simdzone 0.2.7; the content does not establish exploitability or further consequences.
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.