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TI-2026-39852 Aliases CVE-2026-55164GHSA-q437-g7fv-2jvv

Lemur: Plaintext password storage in Lemur user-update path

Priority MEDIUM 56CWE-256Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-256.

Summary

Lemur manages TLS certificate creation. Prior to 1.9.2, lemur.users.service.update assigned a replacement password directly to users.password, while lemur/users/models.py registered User.hash_password only for the before_insert event. Because no before_update listener ran, administrator-initiated password changes through PUT /api/1/users/ were committed as plaintext. The affected user could no longer authenticate normally because bcrypt verification received an unhashed value. A database, backup, replica, query-log, or administrative read compromise exposed immediately usable credentials without offline cracking. The fix registers hashing for before_update and avoids rehashing values that already have a bcrypt prefix. This issue is fixed in version 1.9.2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00289 21st percentileScored 2026-11-07
Fix Fixed lemur (Netflix): 1.9.2lemur (PyPI): 1.9.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Netflixlemurbefore 1.9.21.9.2Patch availableCNA
—lemur (PyPI)before 1.9.21.9.2Patch availableGHSA-q437-g7fv-2jvv
  • lemur VendorNetflix Affected before 1.9.2 Fixed in 1.9.2 Patch available CNA
  • lemur (PyPI) Vendor— Affected before 1.9.2 Fixed in 1.9.2 Patch available GHSA-q437-g7fv-2jvv

Remediation

  • Fix · CNA lemur (Netflix) Fixed in 1.9.2
  • Fix · GHSA-q437-g7fv-2jvv lemur (PyPI) Fixed in 1.9.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55164
  2. 2026-10-03 Alias added: GHSA-q437-g7fv-2jvv

References

Other 4

  • 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
See all 33 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences