{"id":"GO-2026-4803","revision":null,"records":[{"revision":"07b6459811b24fb9aa58bff4c6dcfb64","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-33419","aliases":[],"title":"MinIO: LDAP login brute-force via user enumeration and missing rate limit","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.","state":0,"publishedAt":"2026-03-24T19:05:30.937+00:00","modifiedAt":"2026-03-25T13:24:44.452+00:00","affected":[{"ecosystem":"Vendor product","name":"minio","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"minio\",\n                    \"product\": \"minio\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< RELEASE.2026-03-17T21-25-16Z\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":9.1,"severity":"CRITICAL"}],"references":["https://github.com/minio/minio/security/advisories/GHSA-jv87-32hw-hh99"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-33419","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-33419","identifiers":["CVE-2026-33419"]},"retained":false,"historicalAffected":[]},{"revision":"5db534a9bcb24e19939cc5f7545d790a","observedAt":"2026-11-11T08:36:57.107+00:00","statement":{"source":"euvd","id":"EUVD-2026-15000","aliases":["CVE-2026-33419","GHSA-jv87-32hw-hh99"],"title":"MinIO is a high-performance object storage system. 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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.\n\nAll deployments with LDAP configured running an affected version are impacted.\n\nThere are two vulnerabilities:\n\n1. User Enumeration via Distinguishable Error Messages (CWE-204)\n2. Missing Rate Limiting on STS Authentication Endpoints (CWE-307)\n\nWhen exploited together, an attacker can:\n\n1. Enumerate valid LDAP usernames by observing error message differences.\n3. Perform high-speed password brute-force attacks against confirmed valid users.\n4. Upon finding valid credentials, obtain temporary AWS-style STS credentials (`AccessKeyId`, `SecretAccessKey`, `SessionToken`) with full access to the victim user's S3 resources.\n\n### Affected Versions\n\nAll MinIO releases through the final release of the minio/minio open-source project.\n\n### Patches\n\n**Fixed in**: MinIO AIStor RELEASE.2026-03-17T21-25-16Z\n\n#### Binary Downloads\n\n| Platform | Architecture | Download                                                                    |\n| -------- | ------------ | --------------------------------------------------------------------------- |\n| Linux    | amd64        | [minio](https://dl.min.io/aistor/minio/release/linux-amd64/minio)           |\n| Linux    | arm64        | [minio](https://dl.min.io/aistor/minio/release/linux-arm64/minio)           |\n| macOS    | arm64        | [minio](https://dl.min.io/aistor/minio/release/darwin-arm64/minio)          |\n| macOS    | amd64        | [minio](https://dl.min.io/aistor/minio/release/darwin-amd64/minio)          |\n| Windows  | amd64        | [minio.exe](https://dl.min.io/aistor/minio/release/windows-amd64/minio.exe) |\n\n#### FIPS Binaries\n\n| Platform | Architecture | Download                                                                    |\n| -------- | ------------ | --------------------------------------------------------------------------- |\n| Linux    | amd64        | [minio.fips](https://dl.min.io/aistor/minio/release/linux-amd64/minio.fips) |\n| Linux    | arm64        | [minio.fips](https://dl.min.io/aistor/minio/release/linux-arm64/minio.fips) |\n\n#### Package Downloads\n\n| Format | Architecture | Download                                                                                                                            |\n| ------ | ------------ | ----------------------------------------------------------------------------------------------------------------------------------- |\n| DEB    | amd64        | [minio_20260317212516.0.0_amd64.deb](https://dl.min.io/aistor/minio/release/linux-amd64/minio_20260317212516.0.0_amd64.deb)         |\n| DEB    | arm64        | [minio_20260317212516.0.0_arm64.deb](https://dl.min.io/aistor/minio/release/linux-arm64/minio_20260317212516.0.0_arm64.deb)         |\n| RPM    | amd64        | [minio-20260317212516.0.0-1.x86_64.rpm](https://dl.min.io/aistor/minio/release/linux-amd64/minio-20260317212516.0.0-1.x86_64.rpm)   |\n| RPM    | arm64        | [minio-20260317212516.0.0-1.aarch64.rpm](https://dl.min.io/aistor/minio/release/linux-arm64/minio-20260317212516.0.0-1.aarch64.rpm) |\n\n#### Container Images\n\n```bash\n# Standard\ndocker pull quay.io/minio/aistor/minio:RELEASE.2026-03-17T21-25-16Z\npodman pull quay.io/minio/aistor/minio:RELEASE.2026-03-17T21-25-16Z\n\n# FIPS\ndocker pull quay.io/minio/aistor/minio:RELEASE.2026-03-17T21-25-16Z.fips\npodman pull quay.io/minio/aistor/minio:RELEASE.2026-03-17T21-25-16Z.fips\n```\n\n#### Homebrew (macOS)\n\n```bash\nbrew install minio/aistor/minio\n```\n \n\n### Workarounds\n\n- [Users of the open-source `minio/minio` project should upgrade to MinIO AIStor `RELEASE.2026-03-17T21-25-16Z` or later.](https://docs.min.io/enterprise/aistor-object-store/upgrade-aistor-server/community-edition/)\n\nIf upgrading is not immediately possible:\n\n- **Network-level rate limiting**: Use a reverse proxy (e.g., nginx, HAProxy) or WAF to rate-limit requests to the `/?Action=AssumeRoleWithLDAPIdentity` endpoint.\n- **Firewall restrictions**: Restrict access to the STS endpoint to trusted networks/IP ranges only.\n- **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.","state":0,"publishedAt":"2026-03-20T20:47:54+00:00","modifiedAt":"2026-10-08T08:11:01.4121533+00:00","affected":[{"ecosystem":"Go","name":"github.com/minio/minio","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"last_affected","version":"0.0.0-20260212201848-7aac2a2c5b7c"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"CRITICAL"}],"references":["https://github.com/minio/minio/security/advisories/GHSA-jv87-32hw-hh99","https://nvd.nist.gov/vuln/detail/CVE-2026-33419","https://github.com/minio/minio"],"sourceUrl":"https://github.com/advisories/GHSA-jv87-32hw-hh99","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-jv87-32hw-hh99","identifiers":["GHSA-jv87-32hw-hh99","CVE-2026-33419","GO-2026-4803"]},"retained":false,"historicalAffected":[]},{"revision":"5f64ac7ab31d4d39b0a7d7461b466d74","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-4803","aliases":["CVE-2026-33419","GHSA-jv87-32hw-hh99"],"title":"MinIO LDAP login brute-force via user enumeration and missing rate limit in github.com/minio/minio","description":"MinIO LDAP login brute-force via user enumeration and missing rate limit in github.com/minio/minio","state":0,"publishedAt":"2026-03-23T18:16:18+00:00","modifiedAt":"2026-10-08T08:11:01.4121533+00:00","affected":[{"ecosystem":"Go","name":"github.com/minio/minio","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/minio/minio/security/advisories/GHSA-jv87-32hw-hh99"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-4803","license":"OSV · upstream source license applies","key":"osv:GO-2026-4803","identifiers":["GO-2026-4803","CVE-2026-33419","GHSA-jv87-32hw-hh99"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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