CVE-2026-41589: Wish has SCP Path Traversal that allows arbitrary file read/write

Vulnerability summary

CVE-2026-41589 is a critical (CVSS 9.6) vulnerability in charm wish. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 33.5% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 07-05-2026
   PublishedVulnerability first disclosed.
2. 07-05-2026
   Last modifiedVulnerability information updated.

Description

Wish is an SSH server with defaults and a collection of middlewares. From version 2.0.0 to before version 2.0.1, the SCP middleware in charm.land/wish/v2 is vulnerable to path traversal attacks. A malicious SCP client can read arbitrary files from the server, write arbitrary files to the server, and create directories outside the configured root directory by sending crafted filenames containing ../ sequences over the SCP protocol. This issue has been patched in version 2.0.1.

• CWE-22Improper Limitation of a Pathname to a Restricted DirectoryThe product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.