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Vulnerability record · CVE-2026-45695 · published 16 July 2026

CVE-2026-45695: OS command injection vulnerability

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.

9.8 CVSS 3.1 Critical EPSS 1.6% · top 25.0% CWE-78 · OS command injectionCWE-306 · Missing authentication for critical function Deferred
9.8CVSS 3.1 base score
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
16 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-45695), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.