Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-101337— Stack overwrite from specially formatted base64 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.

When base64 data is split up in pieces, of 3 character or less, tokens were incorrectly calculated to produce 0 bytes. This enables attackers to overwrite the stack with up to 64K of attacker controlled data. Zone files which are written out by NSD itself, suc

CVSS 8.7 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
NLnet Labs NSD 4.10.0< 4.15.3 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-101337

Vulnerability Information

Shenlong is analyzing...

Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Stack overwrite from specially formatted base64 RDATA field
Source: CVE Program / CVE List V5
Vulnerability Description
When base64 data is split up in pieces, of 3 character or less, tokens were incorrectly calculated to produce 0 bytes. This enables attackers to overwrite the stack with up to 64K 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).
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-2026-101337

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-101337

请登录查看更多情报信息。

Other References for CVE-2026-101337 (1)

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

CVE-2026-101341 8.7 HIGH Stack overwrite from specially formatted TXT-DATA 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-2026-101337

No comments yet

Leave a comment