CyberRota Analysis
AI-GeneratedThe vulnerability allows unauthenticated attackers to send excessively large HTTP request bodies to public login endpoints, bypassing the default 1 MiB size limit due to the order of middleware processing. This can lead to memory exhaustion of the Rancher Manager server, resulting in denial of service and making the Rancher API and UI unavailable. Organizations using Rancher should prioritize this issue to prevent potential service interruptions and ensure the security of their cluster management operations.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
Note: these links are listed for security research and verification purposes only.
Original NVD Description
When API audit logging is enabled, the middleware reads the entire HTTP request body into memory without enforcing a size limit on login endpoints. Because the audit middleware is positioned earlier in the handler chain than Rancher's APIBodyLimitingHandler, the body-size cap (default 1 MiB) is bypassed for requests that pass through the audit copyReqBody path. An unauthenticated attacker can send arbitrarily large request bodies to the public login endpoints, causing the Rancher Manager server process to allocate memory proportional to the supplied body size. With just a few concurrent connections, this can exhaust available memory and terminate the Rancher Manager plane process, making the Rancher API and UI unavailable and interrupting management of all downstream clusters.