CVE-2026-101341 Stack overwrite from specially formatted TXT-DATA RDATA field
A stack buffer overflow in NSD allows arbitrary code execution via specially crafted TXT record data in zone files.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-101341?
CVE-2026-101341 is a high-severity memory corruption vulnerability in NLnet Labs NSD, published on 14 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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).
Weakness: CWE-121
Which versions are affected by CVE-2026-101341?
How do I fix CVE-2026-101341?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-101341 being exploited?
There is no known exploitation of CVE-2026-101341 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-101341, DEBIAN-CVE-2026-101341, GHSA-22wp-v7fq-g3x8, UBUNTU-CVE-2026-101341.