CVE-2026-45695
Critical · 9.8Kopia: RCE via SSH ProxyCommand Injection
CVSS
9.8
EPSS
1.6%
Published
May 19, 2026
CISA due date
—
The record
Kopia's HTTP server, when started with `--without-password `, accepts unauthenticated requests to `/api/v1/repo/exists`. The handler forwards an attacker-supplied storage configuration to `blob.NewStorage`. For SFTP backends with `externalSSH: true`, that path constructs a process command line by splitting `sshArguments` on spaces and passes the result directly to `exec.CommandContext("ssh")`. An `-oProxyCommand=<cmd>` token in `sshArguments` causes OpenSSH to invoke `<cmd>` via `$SHELL -c` before any TCP connection is attempted, giving the requester arbitrary command execution as the Kopia process user.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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