CVE-2026-44305: CWE-295: Improper Certificate Validation in Netflix lemur
Lemur manages TLS certificate creation. Prior to 1.9.0, when LDAP TLS is enabled (LDAP_USE_TLS = True), Lemur's LDAP authentication module unconditionally disables TLS certificate verification at the global ldap module level. This allows a man-in-the-middle attacker positioned between Lemur and the LDAP server to intercept all authentication credentials. This vulnerability is fixed in 1.9.0.
AI Analysis
Technical Summary
Netflix Lemur versions before 1.9.0 contain a vulnerability in their LDAP authentication module that disables TLS certificate verification at the global LDAP module level when LDAP_USE_TLS is set to True. This improper certificate validation (CWE-295) enables a man-in-the-middle attacker positioned between Lemur and the LDAP server to intercept all authentication credentials. The vulnerability is resolved in Lemur 1.9.0.
Potential Impact
An attacker capable of positioning themselves between Lemur and the LDAP server can intercept authentication credentials due to disabled TLS certificate verification. This compromises confidentiality and integrity of authentication data but does not affect availability. The CVSS score of 6.8 reflects a medium severity impact with high confidentiality and integrity impact but requiring adjacent network access and high attack complexity.
Mitigation Recommendations
Upgrade Lemur to version 1.9.0 or later where this vulnerability is fixed. Since the vendor advisory indicates the issue is resolved in 1.9.0, applying this official fix fully mitigates the risk. No other mitigations are specified or necessary once patched.
CVE-2026-44305: CWE-295: Improper Certificate Validation in Netflix lemur
Description
Lemur manages TLS certificate creation. Prior to 1.9.0, when LDAP TLS is enabled (LDAP_USE_TLS = True), Lemur's LDAP authentication module unconditionally disables TLS certificate verification at the global ldap module level. This allows a man-in-the-middle attacker positioned between Lemur and the LDAP server to intercept all authentication credentials. This vulnerability is fixed in 1.9.0.
CVSS v3.1
Score 6.8medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Netflix Lemur versions before 1.9.0 contain a vulnerability in their LDAP authentication module that disables TLS certificate verification at the global LDAP module level when LDAP_USE_TLS is set to True. This improper certificate validation (CWE-295) enables a man-in-the-middle attacker positioned between Lemur and the LDAP server to intercept all authentication credentials. The vulnerability is resolved in Lemur 1.9.0.
Potential Impact
An attacker capable of positioning themselves between Lemur and the LDAP server can intercept authentication credentials due to disabled TLS certificate verification. This compromises confidentiality and integrity of authentication data but does not affect availability. The CVSS score of 6.8 reflects a medium severity impact with high confidentiality and integrity impact but requiring adjacent network access and high attack complexity.
Mitigation Recommendations
Upgrade Lemur to version 1.9.0 or later where this vulnerability is fixed. Since the vendor advisory indicates the issue is resolved in 1.9.0, applying this official fix fully mitigates the risk. No other mitigations are specified or necessary once patched.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-05T17:39:31.113Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a03a0decbff5d86101d5c93
Added to database: 05/12/2026, 21:51:26 UTC
Last enriched: 05/12/2026, 22:07:40 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 99
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