CVE-2026-45695CWE-306CWE-78

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

Critical · published July 16, 2026

CVSS v3.1
9.8
EPSS
2%
Percentile
75.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.01610 · 75.7th percentile
Weaknesses
CWE-306 · Missing Authentication for Critical Function; CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-07-16T15:42Z
EPSS history
Timeline
  • 16 JUL 15:42Z
    Kopia: Unauthenticated RCE via SSH ProxyCommand Injection when --insecure --without-password is used
    cvelistv5