What’s Vulnerable › Vulnerabilities

CVE-2026-45695: Kopia: Unauthenticated RCE via SSH ProxyCommand Injection when --insecure --without-password is used

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-16 · updated 2026-07-16
• Weakness: CWE-78

Description

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: before 0.23.0

References

• https://github.com/kopia/kopia/commit/c26c6a1b9734c5089217986ffa5cd19f8a6b8900
• https://github.com/kopia/kopia/pull/5354
• https://github.com/kopia/kopia/releases/tag/v0.23.0
• https://github.com/kopia/kopia/security/advisories/GHSA-2q4c-3mrw-63c3

Get alerted when CVE-2026-45695 or the next vulnerability affects your stack