Rancher

An unauthenticated regex injection vulnerability exists in Rancher Fleet's webhook endpoint when it's configured without a secret, allowing attackers to forge webhook requests using unsanitized repository URL components, which leads to continuous repository re-cloning, causing network and resource exhaustion (Denial of Service) on the management cluster, and potentially service downgrades if the attacker has read access to the target Git repository.

A remote, authenticated attacker can exploit a vulnerability in Rancher Fleet Helm Deployer to bypass security measures and disclose sensitive information, which may enable further attacks.

Fleet's Helm deployer did not fully apply ServiceAccount impersonation in two code paths, allowing a tenant with git push access to a Fleet-monitored repository to read secrets from any namespace on every downstream cluster targeted by their `GitRepo`.

A path traversal vulnerability (CVE-2026-25705) exists in Rancher's Extensions through the `compressedEndpoint` field in a `UIPlugin` deployment, allowing malicious UI extensions to overwrite Rancher binaries, tamper with cluster state, or write to the host filesystem.

An authenticated, remote attacker can exploit a vulnerability in Rancher to execute arbitrary program code and manipulate files, potentially leading to privilege escalation and system compromise.