# CVE-2025-31489: GO-2025-3594 - MinIO performs incomplete signature validation for unsigned-trailer uploads in github.com/minio/minio

Source: https://junglewise.ai/threats/cve-2025-31489-minio-performs-incomplete-signature-validation-for-unsigned  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-04-09  
License: CC BY 4.0 with a link back

CVE-2025-31489 · Severity: medium · CVSS 4 · Published 2025-04-09

MinIO performs incomplete signature validation for unsigned-trailer uploads in github.com/minio/minio

Technologies: [github.com/minio/minio (Go)](https://junglewise.ai/threats/technologies/github-com-minio-minio). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2025-31489 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-31489 being exploited in the wild.

**How severe is CVE-2025-31489?** Medium severity, with a CVSS score of 4, published 9 April 2025.

**Which products and versions are affected?** github.com/minio/minio (Go) SEMVER:introduced=0,fixed=0.0.0-20250403145552-8c70975283f9.

**Is there a fix for CVE-2025-31489?** Yes. github.com/minio/minio (Go): upgrade to 0.0.0-20250403145552-8c70975283f9 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-31489?** Check whether you run github.com/minio/minio (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/minio/minio (Go): upgrade to 0.0.0-20250403145552-8c70975283f9 or later

  ```sh
  go get github.com/minio/minio@v0.0.0-20250403145552-8c70975283f9
  ```


## Affected products

- github.com/minio/minio (Go) SEMVER:introduced=0,fixed=0.0.0-20250403145552-8c70975283f9

## Identifiers

- CVE-2025-31489
- GHSA-wg47-6jq2-q2hh
- GO-2025-3594

## Related threats

- [MinIO path traversal in ReadMultiple storage-REST endpoint](https://junglewise.ai/threats/cve-2026-42600-minio-path-traversal-in-readmultiple-storage-rest-endpoint)
- [MinIO has an Unauthenticated Object Write via Query-String Credential Signature Bypass in Unsigned-Trailer Uploads](https://junglewise.ai/threats/cve-2026-41145-minio-has-an-unauthenticated-object-write-via-query-string)
- [MinIO has an Unauthenticated Object Write via Missing Signature Verification in Unsigned-Trailer Uploads](https://junglewise.ai/threats/cve-2026-40344-minio-has-an-unauthenticated-object-write-via-missing-signature)
- [MinIO denial of service via memory exhaustion in S3 Select CSV parsing](https://junglewise.ai/threats/cve-2026-39414-minio-denial-of-service-via-memory-exhaustion-in-s3-select-csv)
- [MinIO metadata injection in extractMetadataFromMime](https://junglewise.ai/threats/cve-2026-34204-minio-metadata-injection-in-extractmetadatafrommime)