Vulnerability · Published May 12, 2026 · Assigned by GitHub_M

CVE-2026-44304Lemur: LDAP Filter Injection enables post-authentication privilege escalation

High 8.1

In plain English

A high-severity security flaw in lemur from Netflix. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.2%top 87.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	lemur	1.9.0	GHSA-3r34-vq8m-39gh
PyPI	lemur	1.9.0	PYSEC-2026-2585

Affected products (as reported)

Vendor	Product	Versions
Netflix	lemur	< 1.9.0

Weakness: CWE-90 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References

https://github.com/Netflix/lemur/security/advisories/GHSA-3r34-vq8m-39gh x_refsource_CONFIRM