CVE-2026-40344 MinIO has an Unauthenticated Object Write via Missing Signature Verification in Unsigned-Trailer Uploads

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 PutObjectExtractHandler allows any user who knows a valid access key to write...

PT-2026-34231

Name of the Vulnerable Software and Affected Versions MinIO versions RELEASE.2023-05-18T00-05-36Z through RELEASE.2026-04-11T03-20-12Z Description An authentication bypass exists in the Snowball auto-extract handler PutObjectExtractHandler. This issue allows a user with a valid access key to writ...