CVE-2026-88018
Description
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 secret, leading to unauthorized access to the backend storage resolved by the authentication proxy script. This vulnerability results in a complete authentication bypass.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Understanding the Weakness (CWE)
Access Control,Integrity,Confidentiality
Technical Impact: Gain Privileges or Assume Identity; Modify Application Data; Execute Unauthorized Code or Commands
An attacker could gain access to sensitive data and possibly execute unauthorized code.
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