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. gofakes3 then verifies the request’s SigV4 signature against that same empty secret, while Server.auth passes the access key identifier as both the user and authentication value to the proxy without an independent per-identity secret. An unauthenticated network attacker can therefore choose an arbitrary access key, sign with an empty secret, and reach whatever backend the auth-proxy script resolves for that identity. This issue is fixed in version 1.75.1.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. gofakes3 then
    verifies the request’s SigV4 signature against that same empty secret, while Server.auth passes the access
    key identifier as both the user and authentication value to the proxy without an independent per-identity
    secret. An unauthenticated network attacker can therefore choose an arbitrary access key, sign with an
    empty secret, and reach whatever backend the auth-proxy script resolves for that identity. This issue is
    fixed in version 1.75.1. (CVE-2026-88018)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. gofakes3 then     verifies the request's SigV4 signature against that same empty secret, while Server.auth passes the access     key identifier as both the user and authentication value to the proxy without an independent per-identity     secret. An unauthenticated network attacker can therefore choose an arbitrary access key, sign with an     empty secret, and reach whatever backend the auth-proxy script resolves for that identity. This issue is     fixed in version 1.75.1. (CVE-2026-88018)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
447926	SCA: security update for github.com/rclone/rclone (GHSA-xwwr-4h3p-r22c)	Tenable Cloud Security	SCA Checks	Local	critical
447926	SCA: security update for github.com/rclone/rclone (GHSA-xwwr-4h3p-r22c)	Tenable Self-Hosted Container Security	SCA Checks	Local	critical
344701	Linux Distros Unpatched Vulnerability : CVE-2026-88018	Nessus	Misc.	Local	critical

Detections

Analytics

CVE-2026-88018

critical

Tenable Plugins

critical

critical

critical