CVE-2026-33419
MinIO: LDAP login brute-force via user enumeration and missing rate limit
Description
MinIO is a high-performance object storage system. Prior to 2026.03.17, MinIO AIStor's STS (Security Token Service) AssumeRoleWithLDAPIdentity endpoint is vulnerable to LDAP credential brute-forcing due to two combined weaknesses: (1) distinguishable error responses that enable username enumeration, and (2) absence of rate limiting on authentication attempts. An unauthenticated network attacker can enumerate valid LDAP usernames and then perform unlimited password guessing to obtain temporary AWS-style STS credentials, gaining access to the victim's S3 buckets and objects. This issue has been patched in 2026.03.17.
How to fix CVE-2026-33419
To remediate CVE-2026-33419, upgrade the affected package to a fixed version below.
- —upgrade to 2026.03.17 or later
- —no fix listed
- —no fix listed
Is CVE-2026-33419 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 2026.03.17
- from 0, <= 0.0.0-20260212201848-7aac2a2c5b7c
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |