---
title: "CVE-2026-33419: MinIO LDAP login brute-force via user enumeration and missing rate limit"
url: https://erroneo.us/security/cve/CVE-2026-33419/
description: "CVE-2026-33419 (github.com/minio/minio (Go)): MinIO is a high-performance object storage system. Prior to RELEASE.2026-03-17T21-25-16Z, MinIO AIStor's STS…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-24
date_modified: 2026-03-27
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-33419"
kev: false
cvss: 9.1
epss: 0.00562
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.6% , percentile 46: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 46% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/minio/minio (Go) <= 0.0.0-20260212201848-7aac2a2c5b7c, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Go `github.com/minio/minio` <= 0.0.0-20260212201848-7aac2a2c5b7c → fixed: none listed

## Affected products (CVE record)

- minio minio: < RELEASE.2026-03-17T21-25-16Z

## Severity

- GitHub_M CVSS 4.0: 9.1 `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`
- GitHub CVSS 4.0: 9.1 `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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.56% probability of exploitation activity in the next 30 days; percentile 46.

## Sources

- [GitHub Advisory GHSA-jv87-32hw-hh99](https://github.com/advisories/GHSA-jv87-32hw-hh99)
- [CVE.org record CVE-2026-33419](https://www.cve.org/CVERecord?id=CVE-2026-33419)
- [NVD entry CVE-2026-33419](https://nvd.nist.gov/vuln/detail/CVE-2026-33419)
- [github.com](https://github.com/minio/minio/security/advisories/GHSA-jv87-32hw-hh99)

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Source page: https://erroneo.us/security/cve/CVE-2026-33419/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt