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Vulnerability · Published Oct 14, 2026 · Assigned by NLnet Labs

CVE-2026-101339Stack overwrite from a specially crafted and formatted HIP RR

High 8.7

In plain English

A high-severity stack buffer overflow in NSD from NLnet Labs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.3%top 72.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.21nsd4.11.1-r1ALPINE-CVE-2026-101339
Alpine:v3.22nsd4.12.0-r1ALPINE-CVE-2026-101339
Alpine:v3.23nsd4.13.0-r1ALPINE-CVE-2026-101339
Alpine:v3.24nsd4.14.3-r1ALPINE-CVE-2026-101339
Debian:12nsdno fix listedDEBIAN-CVE-2026-101339
Debian:13nsdno fix listedDEBIAN-CVE-2026-101339
Debian:14nsd4.15.3-1DEBIAN-CVE-2026-101339
Ubuntu:26.10nsdno fix listedUBUNTU-CVE-2026-101339

Affected products (as reported)

VendorProductVersions
NLnet Labs NSD 4.10.0 – before 4.15.3

Weakness: CWE-121 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References