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

Quick assessment

Affected
NLnet Labs NSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 di

CVSS 8.7 · High
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I. Basic Information for CVE-2026-101341

Vulnerability Information

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Vulnerability Title
Stack overwrite from specially formatted TXT-DATA RDATA field
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
NLnet Labs NSD 4.10.0 ~ 4.15.3 -

II. Public POCs for CVE-2026-101341

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III. Intelligence Information for CVE-2026-101341

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Other References for CVE-2026-101341 (1)

Same Patch Batch · NLnet Labs · 2026-10-14 · 4 CVEs total

CVE-2026-101337 8.7 HIGH Stack overwrite from specially formatted base64 RDATA field
CVE-2026-101338 8.7 HIGH Stack overwrite from a specially crafted and formatted SVCB or HTTPS RR
CVE-2026-101339 8.7 HIGH Stack overwrite from a specially crafted and formatted HIP RR

IV. Related Vulnerabilities

Same product: NSD
Same vendor: NLnet Labs
Same weakness: CWE-121

V. Comments for CVE-2026-101341

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