BIT-MINIO-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 2023.05.18 and prior to 2026.04.11, an authentication bypass vulnerability in MinIO's Snowball auto-extract handler PutObjectExtractHandler allows any user who knows a valid access key to write arbitrary objects to any bucket without...

CVE-2026-41145

MinIO contains an authentication bypass in the STREAMING-UNSIGNED-PAYLOAD-TRAILER code path, affecting releases prior to RELEASE.2026-04-11T03-20-12Z. An attacker with a valid access key (including default minioadmin or any key with WRITE on a bucket) can write objects to any bucket without a val...

CVE-2026-41145 MinIO has an Unauthenticated Object Write via Query-String Credential Signature Bypass 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 STREAMING-UNSIGNED-PAYLOAD-TRAILER code path allows any user who knows a valid access key to write arbitrary...

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...

CVE-2026-40344

MinIO is affected by an authentication bypass in the Snowball auto-extract handler (PutObjectExtractHandler) prior to RELEASE.2026-04-11T03:20:12Z. An attacker with a valid access key (including the default minioadmin or any key with WRITE on a bucket) can write arbitrary objects to any bucket wi...

MinIO has an Unauthenticated Object Write via Query-String Credential Signature Bypass in Unsigned-Trailer Uploads

Impact What kind of vulnerability is it? Who is impacted? An authentication bypass vulnerability in MinIO's STREAMING-UNSIGNED-PAYLOAD-TRAILER code path allows any user who knows a valid access key to write arbitrary objects to any bucket without knowing the secret key or providing a valid...

GHSA-HV4R-MVR4-25VW MinIO has an Unauthenticated Object Write via Query-String Credential Signature Bypass in Unsigned-Trailer Uploads

Impact What kind of vulnerability is it? Who is impacted? An authentication bypass vulnerability in MinIO's STREAMING-UNSIGNED-PAYLOAD-TRAILER code path allows any user who knows a valid access key to write arbitrary objects to any bucket without knowing the secret key or providing a valid...

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

Impact Two authentication bypass vulnerabilities in MinIO's STREAMING-UNSIGNED-PAYLOAD-TRAILER code path allow any user who knows a valid access key to write arbitrary objects to any bucket without knowing the secret key or providing a valid cryptographic signature. Any MinIO deployment is...

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

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

Improper Verification of Cryptographic Signature

Overview github.com/minio/minio/cmd is an open source object storage server compatible with Amazon S3 APIs. Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature for unsigned-trailer uploads. An attacker can upload arbitrary objects to buckets by usi...

CVE-2025-31489 MinIO performs incomplete signature validation for unsigned-trailer uploads

MinIO is a High Performance Object Storage released under GNU Affero General Public License v3.0. The signature component of the authorization may be invalid, which would mean that as a client you can use any arbitrary secret to upload objects given the user already has prior WRITE permissions on...