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Fencer Vulns
critical 9.8

CVE-2026-45695 json

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

published 2026-05-19 5 mo ago modified 2026-07-16 3 mo ago also GHSA-2q4c-3mrw-63c3 , GO-2026-5009 , EUVD-2026-44948

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known, plus a Nuclei check

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.

Patch / fix

  • go github.com/kopia/kopia 0.23.0
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-45695 updated cvss 6.5

github.com/kopia/kopia: Kopia: Arbitrary code execution via unauthenticated SFTP configuration in HTTP server.

  • Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-velero-plugin-for-mtc-rhel8 Red Hat OpenShift API for Data Protection oadp/oadp-rhel9-operator, oadp/oadp-mustgather-rhel9, oadp/oadp-velero-plugin-for-csi-rhel9, oadp/oadp-kubevirt-velero-plugin-rhel9
    affected: workaround, no fix available “This bug can be rendered unusable by making sure that --without-password is not included in startup options for Kopia HTTP server.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
3 mo ago

Exploit prediction

1.61% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template Kopia Server 0.23.0 - Remote Code Execution nuclei detection template

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go github.com/kopia/kopia
<0.23.0
0.23.0

Affected products

  • kopia kopia

Classification

Weakness
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command
  • CWE-306 Missing Authentication for Critical Functionality

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.