CVE-2026-42600 MinIO: Path Traversal via msgpack Body in `ReadMultiple` Storage-REST Endpoint

Medium 6.9 Published 11 May 2026 Updated 15 May 2026

An attacker with cluster root JWT can read arbitrary files outside configured drive roots via path traversal in the ReadMultiple endpoint.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-42600?

CVE-2026-42600 is a medium-severity path traversal vulnerability in minio, published on 11 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

MinIO is a high-performance object storage system. From RELEASE.2022-07-24T01-54-52Z to before RELEASE.2026-04-14T21-32-45Z, A path traversal vulnerability in MinIO's ReadMultiple internode storage-REST endpoint allows a caller holding the cluster root JWT to read files from outside the configured drive roots, bounded only by the MinIO process UID. The attacker sends POST minio/storage/{drivePath}/v63/rmpl with a msgpack-encoded body carrying ../ sequences in the Bucket field. The server opens the resulting path via os.OpenFile with O_RDONLY|O_NOATIME and returns its contents in the msgpack response stream. This vulnerability is fixed in RELEASE.2026-04-14T21-32-45Z.

Weakness: CWE-22

Which versions are affected by CVE-2026-42600?

3 open source packages ship an affected version, including github.com/minio/minio. It affects 1 product.

Package	Affected	Fixed in
`github.com/minio/minio` Go	All versions	None
`github.com/minio/minio` Go	From `0.0.0-20220724015452`	`0.0.0-20260414213245`
`github.com/minio/minio` Go	From `0.0.0-20220724015452`	`0.0.0-20260414213245`

Products include Minio Minio.

How do I fix CVE-2026-42600?

Upgrade github.com/minio/minio to 0.0.0-20260414213245 or later.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-42600 being exploited?

There is no known exploitation of CVE-2026-42600 in the wild and no public exploit code.

Sources

Also known as GHSA-xh8f-g2qw-gcm7, GO-2026-5757.