--- title: "CVE-2026-101338: NSD - Buffer Overflow" description: "NSD contains a buffer overflow caused by improper handling of SVCB or HTTPS RR wire format RDATA, letting attackers overwrite the stack and write unlimited attacker-controlled data, exploit requires crafted DNS records." url: https://panop.io/threat-heartbeat/CVE-2026-101338/ --- # CVE-2026-101338 NSD - Buffer Overflow NSD contains a buffer overflow caused by improper handling of SVCB or HTTPS RR wire format RDATA, letting attackers overwrite the stack and write unlimited attacker-controlled data, exploit requires crafted DNS records. 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-2026-101338) ## Details Type Buffer Overflow Impact Remote Code Execution, Denial Of Service 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 with proper RDATA handling fixes. 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-2026-101338](https://nvd.nist.gov/vuln/detail/CVE-2026-101338) - [https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-101338.txt](https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-101338.txt) [← All CVEs](https://panop.io/threat-heartbeat/) ## 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 Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)