CVE-2026-44304: Netflix Lemur

High severity, CVSS 8.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Lemur manages TLS certificate creation. Prior to 1.9.0, Lemur's LDAP authentication module (lemur/auth/ldap.py) constructs LDAP search filters using unsanitized user input via Python string interpolation. An authenticated LDAP user can inject LDAP filter metacharacters through the username field to manipulate group membership queries and escalate their privileges to administrator. This vulnerability is fixed in 1.9.0.

Affected products

• Netflix Lemur: before 1.9.0 (fixed in 1.9.0)

Published 2026-05-12. Last modified 2026-06-17.