---
title: "CVE-2026-101339: NSD - Buffer Overflow"
description: "NSD contains a stack buffer overflow caused by a HIP resource record with near-limit RDATA and another dname RDATA field, letting attackers overwrite the stack with up to 191 bytes, exploit requires feeding crafted zone file directly to NSD."
url: https://panop.io/threat-heartbeat/CVE-2026-101339/
---

# CVE-2026-101339 NSD - Buffer Overflow

NSD contains a stack buffer overflow caused by a HIP resource record with near-limit RDATA and another dname RDATA field, letting attackers overwrite the stack with up to 191 bytes, exploit requires feeding crafted zone file directly to NSD.

CVSS base score 8.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-101339)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution

CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

14 October 2026

Updated

15 October 2026

Weakness

[CWE-121](https://cwe.mitre.org/data/definitions/121.html)

## Vendor fix

Update to the latest version of NSD with the fix applied.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-101339](https://nvd.nist.gov/vuln/detail/CVE-2026-101339)
- [https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-101339.txt](https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-101339.txt)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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