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...

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...

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 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-2026-71191

In OpenStack Swift through 2.38.0, S3API middleware does not enforce that semantic x-amz- headers are covered by the SigV4 signature on presigned URL requests. An attacker who obtains a presigned PUT URL can inject an unsigned X-Amz-Copy-Source header, causing Swift to perform a server-side copy...