Critical 9.8Published Jul 16, 2026

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

Updated under an hour ago (Oct 27, 2026, 8:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-78, CWE-306
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

kopia kopia kopia:kopia (from the name)	before 0.23.0	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.