CVE-2026-55164: Netflix Lemur

Medium severity, CVSS 4.9. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Netflix Lemur: before 1.9.2 (fixed in 1.9.2)

Published 2026-08-18. Last modified 2026-09-08.