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CVE-2026-33419— MinIO: LDAP login brute-force via user enumeration and missing rate limit

Quick assessment

Affected
minio minio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MinIO是美国MinIO公司的一款开源的对象存储服务器。该产品支持构建用于机器学习、分析和应用程序数据工作负载的基础架构。 MinIO RELEASE.2026-03-17T21-25-16Z之前版本存在安全漏洞，该漏洞源于STS AssumeRoleWithLDAPIdentity端点存在可区分的错误响应且缺少速率限制，可能导致LDAP凭据暴力破解。

AI Predicted 8.1 Difficulty: Easy EPSS 0.54% · P44
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I. Basic Information for CVE-2026-33419

Vulnerability Information
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Vulnerability Title
MinIO: LDAP login brute-force via user enumeration and missing rate limit
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
响应差异性信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
MinIO 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MinIO是美国MinIO公司的一款开源的对象存储服务器。该产品支持构建用于机器学习、分析和应用程序数据工作负载的基础架构。 MinIO RELEASE.2026-03-17T21-25-16Z之前版本存在安全漏洞，该漏洞源于STS AssumeRoleWithLDAPIdentity端点存在可区分的错误响应且缺少速率限制，可能导致LDAP凭据暴力破解。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
minio minio < RELEASE.2026-03-17T21-25-16Z -

II. Public POCs for CVE-2026-33419

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III. Intelligence Information for CVE-2026-33419

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IV. Related Vulnerabilities

Same product: minio
Same vendor: minio
Same weakness: CWE-204

V. Comments for CVE-2026-33419

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