Lemur: LDAP Filter Injection enables post-authentication privilege escalation
Priority HIGH 70CWE-90Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00217 12th 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-3r34-vq8m-39gh |
- 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-3r34-vq8m-39gh
Remediation
- Fix · CNA lemur (Netflix) Fixed in 1.9.0
- Fix · GHSA-3r34-vq8m-39gh lemur (PyPI) Fixed in 1.9.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-44304
- 2026-10-03 Alias added: GHSA-3r34-vq8m-39gh
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-2026-49966 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
- TI-2026-49964 Server-side request forgery in Netflix lemur CVSS 3.1HIGH 7.7
Sources
- CVE-2026-44304 · CVE Program
- CVE-2026-44304 · NVD
- FIRST EPSS
- GHSA-3r34-vq8m-39gh · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences