CVE-2026-33322: MinIO is a high-performance object storage system

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-33322 is a critical-severity flaw (CVSS 9.8) affecting minio. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MinIO is a high-performance object storage system. From RELEASE.2022-11-08T05-27-07Z to before RELEASE.2026-03-17T21-25-16Z, a JWT algorithm confusion vulnerability in MinIO's OpenID Connect authentication allows an attacker who knows the OIDC ClientSecret to forge arbitrary identity tokens and obtain S3 credentials with any policy, including consoleAdmin. This issue has been patched in RELEASE.2026-03-17T21-25-16Z.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-287
Published	2026-03-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: minio

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-24 20:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

minio minio UPGRADE

Affected: >= 2022-11-08t05-27-07z and < 2026-03-17t21-25-16z

Fixed in: 2026-03-17t21-25-16z

Safe to downgrade to: a release before 2022-11-08t05-27-07z

1. Check installed version

apt-cache policy minio || rpm -q minio || minio --version

2. UPGRADE to 2026-03-17t21-25-16z (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade minio

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade minio

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2022-11-08t05-27-07z (Debian / Ubuntu)

apt-cache madison minio sudo apt install minio=<VERSION_BEFORE_2022-11-08t05-27-07z> sudo apt-mark hold minio

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list minio sudo dnf downgrade minio-<VERSION_BEFORE_2022-11-08t05-27-07z> sudo dnf versionlock add minio

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33322?

minio: upgrade to 2026-03-17t21-25-16z. Exact commands for each OS are on this page.

Is CVE-2026-33322 being exploited?

CVE-2026-33322 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33322 affect?

CVE-2026-33322 affects minio. Severity is critical (CVSS 9.8). MinIO is a high-performance object storage system. From RELEASE.2022-11-08T05-27-07Z to before RELEASE.2026-03-17T21-25-16Z, a JWT algorithm confusion vulnerability in MinIO's OpenID Connect authentication allows an attacker who knows the O

How urgent is CVE-2026-33322?

Priority 48/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

MinIO vulnerabilities

Related CVEs

CVE-2026-39414 MEDIUM 6.5 UPGRADE MinIO is a high-performance object storage system
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CVE-2026-41145 HIGH 8.2 UPGRADE MinIO is a high-performance object storage system
CVE-2026-40344 HIGH 8.2 UPGRADE MinIO is a high-performance object storage system
CVE-2026-33419 HIGH 7.5 UPGRADE MinIO is a high-performance object storage system

References

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