CVE-2026-45695: Kopia

Critical severity, CVSS 9.8. EPSS: 1.6% chance of exploitation in the next 30 days.

Kopia is a cross-platform backup tool for Windows, macOS, and Linux with fast incremental backups, client-side end-to-end encryption, compression, and data deduplication. Prior to 0.23.0, Kopia's HTTP server started with --without-password accepts unauthenticated requests to /api/v1/repo/exists and forwards attacker-supplied SFTP storage configuration to blob.NewStorage, where externalSSH: true and sshArguments containing -oProxyCommand=<cmd> can cause exec.CommandContext("ssh") to invoke the command through OpenSSH. This issue is fixed in version 0.23.0.

Affected products

• Kopia Kopia: before 0.23.0 (fixed in 0.23.0)

Published 2026-07-16. Last modified 2026-07-16.