TI-2026-33436 Aliases CVE-2026-45695 GHSA-2q4c-3mrw-63c3

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

MEDIUM 52CWE-306Published 2026-07-16 · Updated 2026-07-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass, Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-306 and CWE-78.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0161 76th percentileScored 2026-11-07

Fix Partial kopia (kopia): 0.23.0github.com/kopia/kopia (Go): 0.23.0Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
kopia	kopia	before 0.23.0	0.23.0	Patch available	CNA
—	github.com/kopia/kopia (Go)	before 0.23.0	0.23.0	Patch available	GHSA-2q4c-3mrw-63c3

kopia Vendorkopia Affected before 0.23.0 Fixed in 0.23.0 Patch available CNA
github.com/kopia/kopia (Go) Vendor— Affected before 0.23.0 Fixed in 0.23.0 Patch available GHSA-2q4c-3mrw-63c3

Remediation

Fix · CNA kopia (kopia) Fixed in 0.23.0
Fix · GHSA-2q4c-3mrw-63c3 github.com/kopia/kopia (Go) Fixed in 0.23.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Migration Toolkit for Containers	Affected	No fix yet: Fix deferred
OpenShift API for Data Protection	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-45695
2026-10-03 Alias added: GHSA-2q4c-3mrw-63c3

References

Other 5

TI-2026-86089 Kopia Path Traversal in Snapshot Restore via Directory Entry Names CVSS 4.0MEDIUM 6.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences