CVE-2026-44305Public exploit

Credential interception via disabled LDAP certificate validation

Published May 12, 2026 · Updated May 12, 2026

Improper certificate validation in Netflix Lemur before 1.9.0 allows man-in-the-middle attackers to intercept LDAP credentials. In lemur/auth/ldap.py, the _bind() method sets the process-wide ldap.OPT_X_TLS_REQUIRE_CERT option to ldap.OPT_X_TLS_NEVER, accepting untrusted LDAP certificates. When LDAP_USE_TLS is enabled and an attacker can interpose between Lemur and its LDAP server, the attacker can read credentials and alter group responses.

CVSS severity6.8
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Netflix Lemur before 1.9.0 allows man-in-the-middle attackers to intercept LDAP credentials. In lemur/auth/ldap.py, the _bind() method sets the process-wide ldap.OPT_X_TLS_REQUIRE_CERT option to ldap.OPT_X_TLS_NEVER, accepting untrusted LDAP certificates. When LDAP_USE_TLS is enabled and an attacker can interpose between Lemur and its LDAP server, the attacker can read credentials and alter group responses.

The record

CVE
CVE-2026-44305
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Netflix
Product
Lemur
Classifications
CWE-295, T1557
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.9.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Netflix · Lemurversion=< 1.9.0

Published CVSS scores

6.8GitHubCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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