What’s Vulnerable › Vulnerabilities
CVE-2026-101339: Stack overwrite from a specially crafted and formatted HIP RR
- Severity: high (CVSS 8.7 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-14 · updated 2026-10-16
- Weakness: CWE-121
Description
A HIP resource record that fills the RDATA near or at is limit, and has another dname RDATA field (a HIP Rendezvous server) can overwrite the stack with up to 191 bytes of attacker controlled data. Zone files which are written out by NSD itself, such as for zones for which the NSD instance is secondary, will not be formatted like this. The zone file must be fed to NSD directly, (but it could come, for example, from an operator controlled provisioning system).
Affected products
- NLnet Labs NSD: from 4.10.0 before 4.15.3 — fixed in 4.15.3
How to fix
Upgrade to a fixed version: NLnet Labs NSD 4.15.3. Check the vendor advisory for mitigations.
References
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