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

Severity: medium (CVSS 4.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 8.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-11 · updated 2026-06-17
Weakness: CWE-22

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.

Affected products

minio: from 2022-07-24t01-54-52z before 2026-04-14t21-32-45z — fixed in 2026-04-14t21-32-45z

How to fix

Upgrade to a fixed version: minio 2026-04-14t21-32-45z. Check the vendor advisory for mitigations.

References

https://github.com/minio/minio/security/advisories/GHSA-xh8f-g2qw-gcm7

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