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

CVE-2026-101341Stack overwrite from specially formatted TXT-DATA RDATA field

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

Tokens of text in RDATA (of for example TXT records) under 32 bytes are not checked to stay within the space reserved for the RDATA allowing for arbitrary sized out of bound stack writes, including an overwrite of a callback function pointer which is called directly after parse. Zone files which are written out by NSD itself, such 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-2026-101341
Alpine:v3.22nsd4.12.0-r1ALPINE-CVE-2026-101341
Alpine:v3.23nsd4.13.0-r1ALPINE-CVE-2026-101341
Alpine:v3.24nsd4.14.3-r1ALPINE-CVE-2026-101341
Debian:12nsdno fix listedDEBIAN-CVE-2026-101341
Debian:13nsdno fix listedDEBIAN-CVE-2026-101341
Debian:14nsd4.15.3-1DEBIAN-CVE-2026-101341
Ubuntu:26.10nsdno fix listedUBUNTU-CVE-2026-101341

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