Lemur: LDAP TLS certificate verification globally disabled enables credential interception
Priority HIGH 65CWE-295Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-295.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00143 3rd percentileScored 2026-11-07
Fix Fixed lemur (Netflix): 1.9.0lemur (PyPI): 1.9.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Netflix | lemur | before 1.9.0 | 1.9.0 | Patch available | CNA |
| — | lemur (PyPI) | before 1.9.0 | 1.9.0 | Patch available | GHSA-vr7c-r5gj-j3w5 |
- lemur VendorNetflix Affected before 1.9.0 Fixed in 1.9.0 Patch available CNA
- lemur (PyPI) Vendor— Affected before 1.9.0 Fixed in 1.9.0 Patch available GHSA-vr7c-r5gj-j3w5
Remediation
- Fix · CNA lemur (Netflix) Fixed in 1.9.0
- Fix · GHSA-vr7c-r5gj-j3w5 lemur (PyPI) Fixed in 1.9.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-44305
- 2026-10-03 Alias added: GHSA-vr7c-r5gj-j3w5
References
More Netflix vulnerabilities
- TI-2024-04374 Path Traversal vulnerability via File Uploads in Genie CVSS 3.1CRITICAL 9.9
- TI-2023-21044 Dispatch writes JWT tokens in error message CVSS 3.1CRITICAL 9.1
- TI-2026-39854 Improper authorization in Netflix lemur CVSS 3.1CRITICAL 9.9
- TI-2026-32272 Lemur: LDAP Filter Injection enables post-authentication privilege escalation CVSS 3.1HIGH 8.1
- TI-2026-49966 Lemur: Unchecked `replaces[]` lets any user silence notifications and hijack auto-rotation for arbitrary certificates CVSS 3.1HIGH 8.1
- TI-2026-49965 Missing authorization in Netflix lemur CVSS 3.1HIGH 7.7
Sources
- CVE-2026-44305 · CVE Program
- CVE-2026-44305 · NVD
- FIRST EPSS
- GHSA-vr7c-r5gj-j3w5 · GitHub Advisory Database · CC BY 4.0
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