CVE-2026-45695
CriticalExploitedKopia: RCE via SSH ProxyCommand Injection
Published May 19, 2026 · Updated Aug 12, 2026 · Also known as EUVD-2026-44948, GHSA-2q4c-3mrw-63c3, GO-2026-5009
Key Facts
Patch immediately- CVE-2026-45695 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting github.com/kopia/kopia (go), kopia.
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Sep 10, 2026. No public exploit code is known.
- EPSS estimates a 1.6% probability of exploitation in the next 30 days.
- Fixed versions are available, including github.com/kopia/kopia 0.23.0, kopia 0.23.0.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
1.6%
Higher than 75.5% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
None known
Get the full CVE-2026-45695 brief as a PDF
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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= can cause exec.CommandContext("ssh") to invoke the command through OpenSSH. This issue is fixed in version 0.23.0.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Sep 10, 2026 | n/a | Not reported |
| CIRCL KEV | Sep 10, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/kopia/kopiago | See advisory | 0.23.0 |
| kopia | See advisory | 0.23.0 |
Patched Releases
github.com/kopia/kopia
0.23.0
kopia
0.23.0
Timeline
Publicly disclosed
May 19, 2026
Last updated
Aug 12, 2026
Added to Industry KEV feed
Sep 10, 2026
Added to CIRCL KEV
Sep 10, 2026
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
- CWE-306 Missing Authentication for Critical Function
References
- advisoryGHSA advisory
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45695.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-45695
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: github.com/kopia/kopia (go); kopia. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Sep 10, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including github.com/kopia/kopia 0.23.0, kopia 0.23.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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