What’s Vulnerable › Vulnerabilities
CVE-2026-101341: Stack overwrite from specially formatted TXT-DATA RDATA field
- 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
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 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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