FKIE_CVE-2026-45695

Vulnerability from fkie_nvd - Published: 2026-07-16 16:19 - Updated: 2026-07-16 17:18
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
security-advisories@github.comhttps://github.com/kopia/kopia/commit/c26c6a1b9734c5089217986ffa5cd19f8a6b8900
security-advisories@github.comhttps://github.com/kopia/kopia/pull/5354
security-advisories@github.comhttps://github.com/kopia/kopia/releases/tag/v0.23.0
security-advisories@github.comhttps://github.com/kopia/kopia/security/advisories/GHSA-2q4c-3mrw-63c3
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "kopia",
          "vendor": "kopia",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.23.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s 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=\u003ccmd\u003e can cause exec.CommandContext(\"ssh\") to invoke the command through OpenSSH. This issue is fixed in version 0.23.0."
    }
  ],
  "id": "CVE-2026-45695",
  "lastModified": "2026-07-16T17:18:15.407",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-16T16:19:08.307",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kopia/kopia/commit/c26c6a1b9734c5089217986ffa5cd19f8a6b8900"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kopia/kopia/pull/5354"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kopia/kopia/releases/tag/v0.23.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kopia/kopia/security/advisories/GHSA-2q4c-3mrw-63c3"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        },
        {
          "lang": "en",
          "value": "CWE-306"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}



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