Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.
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Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-12. NVD baseline CVSS 9.8; sources differ by 0.0.
Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.
May 12, 2026
June 5, 2026
Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41089These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
Working exploit code is in the public domain (4 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
CVE-2026-41089 - Windows Netlogon CLDAP Remote Code Execution Exploit (CVSS 9.8)
Open source ↗CVE-2026-41089 checker: unauthenticated, non-destructive detection for the Netlogon CLDAP stack buffer overflow (CVSS 9.8). Reports whether a domain controller's domain is long enough to crash, without sending the overflow. The binary-verified analysis the public PoCs got wrong.
Open source ↗CVE-2026-41089
Open source ↗CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
Open source ↗See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-41089
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.
msrc
CWE-121