CVE-2026-33419 MinIO: LDAP login brute-force via user enumeration and missing rate limit
Attackers can brute-force LDAP credentials via the STS endpoint to gain unauthorized access to S3 buckets and objects.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33419?
CVE-2026-33419 is a critical authentication bypass vulnerability in minio, published on 24 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
MinIO is a high-performance object storage system. Prior to RELEASE.2026-03-17T21-25-16Z, 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 RELEASE.2026-03-17T21-25-16Z.
Which versions are affected by CVE-2026-33419?
3 open source packages ship an affected version, including github.com/minio/minio. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/minio/minio Go | All versions | None |
github.com/minio/minio Go | All versions to 0.0.0-20260212201848-7aac2a2c5b7c | None |
github.com/minio/minio Go | All versions to 0.0.0-20260212201848-7aac2a2c5b7c | None |
Products include Minio Minio.
How do I fix CVE-2026-33419?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-33419 being exploited?
There is no known exploitation of CVE-2026-33419 in the wild and no public exploit code.
Other vulnerabilities in minio
- CVE-2023-28434 MinIO Security Feature Bypass
- CVE-2023-28432 MinIO Information Disclosure
- CVE-2020-11012 Authentication bypass MinIO Admin API
- CVE-2026-33322 MinIO: JWT Algorithm Confusion in OIDC Authentication
- CVE-2026-40344 MinIO has an Unauthenticated Object Write via Missing Signature Verification in Unsigned-Trailer Uploads
Sources
Also known as GHSA-jv87-32hw-hh99, GO-2026-4803, MINI-332m-jx4w-xqgc, MINI-q8w4-wxgw-6h7p.