CVE-2026-34339

MEDIUMNVD 5.55.5—

5.5

Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an authorized attacker to deny service locally.

CVSS v3: 5.5
EG Score: 5.5(high)
EPSS: 13.0%
KEV: Not listed

Published

May 12, 2026

Last Modified

May 14, 2026

References (1)

secure@microsofthttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34339

Vendor Advisories for CVE-2026-34339(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2026-34339
Microsoft Security Response Center (MSRC)Denial of Service
Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability

Frequently asked(5)

What is CVE-2026-34339?

CVE-2026-34339 is a medium vulnerability published on May 12, 2026. Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an authorized attacker to deny service locally.

When was CVE-2026-34339 disclosed?

CVE-2026-34339 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-34339 actively exploited?

CVE-2026-34339 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 13.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-34339?

CVE-2026-34339 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2026-34339?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34339, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2026-34339

📅 Published

🔄 Last Modified

🔗 References (1)

📣 Vendor Advisories for CVE-2026-34339(1)

❓ Frequently asked(5)