ceph: ceph: RGW SigV4 verifier allows attachment of arbitrary unsigned x-amz-* headers leading to privilege escalation

A flaw was found in Ceph RGW's SigV4 signature verification handler. When processing S3 requests, RGW verifies only the headers explicitly listed in the X-Amz-SignedHeaders field but does not reject requests that carry additional unsigned x-amz- headers. This diverges from the AWS S3 specificatio...

Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS : Ceph vulnerability (USN-8867-1)

The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8867-1 advisory. It was discovered that the Ceph Object Gateway RGW SigV4 handler did not reject requests carrying x-amz- headers that were absent from the...

USN-8867-1 ceph vulnerability

It was discovered that the Ceph Object Gateway RGW SigV4 handler did not reject requests carrying x-amz- headers that were absent from the signed header set. An attacker holding a presigned URL could possibly use this issue to attach arbitrary unsigned x-amz- headers that RGW would honor, allowin...

USN-8867-1: Ceph vulnerability

It was discovered that the Ceph Object Gateway RGW SigV4 handler did not reject requests carrying x-amz- headers that were absent from the signed header set. An attacker holding a presigned URL could possibly use this issue to attach arbitrary unsigned x-amz- headers that RGW would honor, allowin...

CVE-2026-88018

A flaw was found in rclone. When the rclone serve s3 command is configured with --auth-proxy but without --auth-key, an unauthenticated network attacker can bypass the SigV4 signature verification process. This allows the attacker to use an arbitrary access key and sign requests with an empty...

CVE-2026-94368

A flaw was found in the signature verification logic of noobaa-core, the core component of the NooBaa Multicloud Object Gateway. The issue occurs when the service processes S3 presigned URLs using Signature Version 4 SigV4. Due to improper validation, the service fails to reject requests containi...

CVE-2026-94368 Noobaa-core: noobaa-core: presigned put url escalation to copyobject via unsigned x-amz-copy-source header

A flaw was found in the signature verification logic of noobaa-core, the core component of the NooBaa Multicloud Object Gateway. The issue occurs when the service processes S3 presigned URLs using Signature Version 4 SigV4. Due to improper validation, the service fails to reject requests containi...

EUVD-2026-83898

A flaw was found in the signature verification logic of noobaa-core, the core component of the NooBaa Multicloud Object Gateway. The issue occurs when the service processes S3 presigned URLs using Signature Version 4 SigV4. Due to improper validation, the service fails to reject requests containi...

CVE-2026-94368

NooBaa-core , the core component of the NooBaa Multicloud Object Gateway , contains a flaw in its SigV4 signature verification logic. When processing S3 presigned URLs, the service drops unsigned x-amz- headers from the signature calculation instead of rejecting them. An attacker holding a valid ...

CVE-2026-94368

A flaw was found in the signature verification logic of noobaa-core, the core component of the NooBaa Multicloud Object Gateway. The issue occurs when the service processes S3 presigned URLs using Signature Version 4 SigV4. Due to improper validation, the service fails to reject requests containi...

CVE-2026-94368: Improper Verification of Cryptographic Signature

A flaw was found in the signature verification logic of noobaa-core, the core component of the NooBaa Multicloud Object Gateway. The issue occurs when the service processes S3 presigned URLs using Signature Version 4 SigV4. Due to improper validation, the service fails to reject requests containi...

Rclone < 1.75.1 S3 Serve SigV4 Signature Bypass (CVE-2026-88018)

The version of Rclone installed on the remote host is prior to 1.75.1. It is, therefore, affected by an authentication bypass vulnerability: - When rclone serve s3 is configured with --auth-proxy and without --auth-key, the authPairMiddleware handler parses the access key ID out of the...

GO-2026-6462 rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypass in github.com/rclone/rclone

rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypass in github.com/rclone/rclone...

BIT-RCLONE-2026-88018 rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypass

rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.1, rclone serve s3 configured with --auth-proxy but without --auth-key allows authPairMiddleware to register any client-chosen accessKeyID with an empty ws.s3Secret. gofakes...

rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypass

Summary rclone serve s3's handler chain, when --auth-proxy is configured, is outermost first: authPairMiddleware - proxyAuthMiddleware - gofakes3's own SigV4-verifying handler. authPairMiddleware parses the accessKeyID straight out of the incoming request's own Authorization header entirely...

GHSA-XWWR-4H3P-R22C rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypass

Summary rclone serve s3's handler chain, when --auth-proxy is configured, is outermost first: authPairMiddleware - proxyAuthMiddleware - gofakes3's own SigV4-verifying handler. authPairMiddleware parses the accessKeyID straight out of the incoming request's own Authorization header entirely...

DEBIAN-CVE-2026-88018

rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.1, rclone serve s3 configured with --auth-proxy but without --auth-key allows authPairMiddleware to register any client-chosen accessKeyID with an empty ws.s3Secret. gofakes...

CVE-2026-88018 rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypass

rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.1, rclone serve s3 configured with --auth-proxy but without --auth-key allows authPairMiddleware to register any client-chosen accessKeyID with an empty ws.s3Secret. gofakes...

CVE-2026-88018

rclone (a command-line tool for syncing files to cloud storage) contains a SigV4 signature bypass in its serve s3 mode. When configured with --auth-proxy but without --auth-key, the authPairMiddleware registers any client-chosen accessKeyID with an empty secret. The embedded gofakes3 component th...

CVE-2026-88018 rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypass

rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.1, rclone serve s3 configured with --auth-proxy but without --auth-key allows authPairMiddleware to register any client-chosen accessKeyID with an empty ws.s3Secret. gofakes...