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Docker CVE-2026-33419

CRITICAL
Observable Response Discrepancy (CWE-204)
2026-03-20 https://github.com/minio/minio GHSA-jv87-32hw-hh99
Information Disclosure Docker Apple Microsoft Nginx Suse
9.1
CVSS 4.0
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CVSS VectorNVD

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Mar 20, 2026 - 21:01 vuln.today
CVE Published
Mar 20, 2026 - 20:47 nvd
CRITICAL 9.1

DescriptionNVD

Impact

_What kind of vulnerability is it? Who is impacted?_

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.

All deployments with LDAP configured running an affected version are impacted.

There are two vulnerabilities:

  1. User Enumeration via Distinguishable Error Messages (CWE-204)
  2. Missing Rate Limiting on STS Authentication Endpoints (CWE-307)

When exploited together, an attacker can:

  1. Enumerate valid LDAP usernames by observing error message differences.
  2. Perform high-speed password brute-force attacks against confirmed valid users.
  3. Upon finding valid credentials, obtain temporary AWS-style STS credentials (AccessKeyId, SecretAccessKey, SessionToken) with full access to the victim user's S3 resources.

Affected Versions

All MinIO releases through the final release of the minio/minio open-source project.

Patches

Fixed in: MinIO AIStor RELEASE.2026-03-17T21-25-16Z #### Binary Downloads

PlatformArchitectureDownload
Linuxamd64minio
Linuxarm64minio
macOSarm64minio
macOSamd64minio
Windowsamd64minio.exe

#### FIPS Binaries

PlatformArchitectureDownload
Linuxamd64minio.fips
Linuxarm64minio.fips

#### Package Downloads

FormatArchitectureDownload
DEBamd64minio_20260317212516.0.0_amd64.deb
DEBarm64minio_20260317212516.0.0_arm64.deb
RPMamd64minio-20260317212516.0.0-1.x86_64.rpm
RPMarm64minio-20260317212516.0.0-1.aarch64.rpm

#### Container Images

bash
# Standard
docker pull quay.io/minio/aistor/minio:RELEASE.2026-03-17T21-25-16Z
podman pull quay.io/minio/aistor/minio:RELEASE.2026-03-17T21-25-16Z
# FIPS
docker pull quay.io/minio/aistor/minio:RELEASE.2026-03-17T21-25-16Z.fips
podman pull quay.io/minio/aistor/minio:RELEASE.2026-03-17T21-25-16Z.fips

#### Homebrew (macOS)

bash
brew install minio/aistor/minio

Workarounds

If upgrading is not immediately possible:

  • Network-level rate limiting: Use a reverse proxy (e.g., nginx, HAProxy) or WAF to rate-limit requests to the /?Action=AssumeRoleWithLDAPIdentity endpoint.
  • Firewall restrictions: Restrict access to the STS endpoint to trusted networks/IP ranges only.
  • LDAP account lockout: Configure account lockout policies on the LDAP server itself (e.g., Active Directory lockout threshold). Note: this protects against brute-force but not enumeration, and may cause denial-of-service for legitimate users.

AnalysisAI

MinIO AIStor's Security Token Service (STS) AssumeRoleWithLDAPIdentity endpoint contains two combined vulnerabilities that enable LDAP credential brute-forcing: distinguishable error messages allowing username enumeration (CWE-204) and missing rate limiting (CWE-307). All MinIO deployments through the final open-source release with LDAP authentication enabled are affected. …

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RemediationAI

Within 24 hours: Identify all MinIO instances with LDAP enabled and disable the AssumeRoleWithLDAPIdentity endpoint if not actively used; enable network segmentation to restrict access to the STS endpoint. Within 7 days: Implement WAF rules to rate-limit authentication attempts and block patterns consistent with credential enumeration; conduct audit logs for unauthorized access attempts. …

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CVE-2026-33419 vulnerability details – vuln.today
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