What is CVE-2026-40344?

CVE-2026-40344 is a high-severity vulnerability in Minio, classified under Improper Authentication. CVSS score: 8.2/10. Published 2026-04-22.

How severe is CVE-2026-40344?

High severity. CVSS v3 base score is 8.2 out of 10.

Auth bypass in Minio

CVE-2026-40344

MinIO is a high-performance object storage system. Starting in RELEASE.2023-05-18T00-05-36Z and prior to RELEASE.2026-04-11T03-20-12Z, an authentication bypass vulnerability in MinIO's Snowball auto-extract handler (`PutObjectExtractHandle…

Vulnerability class: Broken Authentication

EPSS: 0.004 (33.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L.

Affected products

Minio — versions >= RELEASE.2023-05-18T00-05-36Z, < RELEASE.2026-04-11T03-20-12Z

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, Issue Tracking)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-40344?: CVE-2026-40344 is a high-severity vulnerability in Minio, classified under Improper Authentication. CVSS score: 8.2/10. Published 2026-04-22.
How severe is CVE-2026-40344?: High severity. CVSS v3 base score is 8.2 out of 10.