CVE-2026-40344

high

Published 2026-04-22 · Modified 2026-06-03

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

8.2

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

CVSS v4 NEW

8.8

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

VIR risk

8.2

Description

MinIO has an Unauthenticated Object Write via Missing Signature Verification in Unsigned-Trailer Uploads

Predictions

Exploit likelihood

88%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Package impact

Ecosystem	Package	Vulnerable	Fixed
Go	github.com/minio/minio	`>=0.0.0-20230506025312-76913a9fd5c6,<=0.0.0-20260212201848-7aac2a2c5b7c`
GO	github.com/minio/minio	`>= 0.0.0-20230506025312-76913a9fd5c6, <= 0.0.0-20260212201848-7aac2a2c5b7c`

Application impact

Vendor	Product	Versions	Fixed
minio	minio	`{"startIncluding":"2023-05-18t00-05-36z","endExcluding":"2026-04-11T03-20-12Z"}`	`2026-04-11T03-20-12Z`

References

CWEs

CWE-287 CWE-306

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.