FKIE_CVE-2026-42085

Vulnerability from fkie_nvd - Published: 2026-05-04 18:16 - Updated: 2026-05-08 19:54
Severity
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Summary
OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. Prior to versions 6.10.5 and 7.0.0-rc3, OpenC3 COSMOS contains a design flaw in the save_tool_config() function that allows saving tool configuration files at arbitrary locations inside the shared /plugins directory tree by supplying crafted configuration filenames. Although the implementation sufficiently mitigates standard path traversal attacks, by canonicalizing filename to an absolute path, all plugins share this same root directory. That enables users to create arbitrary file structures and overwrite existing configuration files within the shared /plugins directory. This issue has been patched in versions 6.10.5 and 7.0.0-rc3.
References
security-advisories@github.comhttps://github.com/OpenC3/cosmos/commit/9957a9fa460c0c0cf5cdbf6a5931bbdd025246a5Patch
security-advisories@github.comhttps://github.com/OpenC3/cosmos/commit/e6efccbd148ba0e3361c5891027f2373aa140d42Patch
security-advisories@github.comhttps://github.com/OpenC3/cosmos/releases/tag/v6.10.5Release Notes
security-advisories@github.comhttps://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3Release Notes
security-advisories@github.comhttps://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45hExploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45hExploit, Vendor Advisory
Impacted products
Vendor Product Version
openc3 cosmos *
openc3 cosmos 7.0.0
openc3 cosmos 7.0.0
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:openc3:cosmos:*:*:*:*:open_source:*:*:*",
              "matchCriteriaId": "930EEABE-50A2-4005-AE3C-2D14AF5A60BD",
              "versionEndExcluding": "6.10.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openc3:cosmos:7.0.0:rc1:*:*:open_source:*:*:*",
              "matchCriteriaId": "38B72355-49A3-4D2F-BFDB-EE53C9E2C7AD",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openc3:cosmos:7.0.0:rc2:*:*:open_source:*:*:*",
              "matchCriteriaId": "13E3A0EA-1085-4505-80BB-C0B133EC3498",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. Prior to versions 6.10.5 and 7.0.0-rc3, OpenC3 COSMOS contains a design flaw in the save_tool_config() function that allows saving tool configuration files at arbitrary locations inside the shared /plugins directory tree by supplying crafted configuration filenames. Although the implementation sufficiently mitigates standard path traversal attacks, by canonicalizing filename to an absolute path, all plugins share this same root directory. That enables users to create arbitrary file structures and overwrite existing configuration files within the shared /plugins directory. This issue has been patched in versions 6.10.5 and 7.0.0-rc3."
    }
  ],
  "id": "CVE-2026-42085",
  "lastModified": "2026-05-08T19:54:30.723",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-04T18:16:30.510",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/OpenC3/cosmos/commit/9957a9fa460c0c0cf5cdbf6a5931bbdd025246a5"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
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      ],
      "url": "https://github.com/OpenC3/cosmos/commit/e6efccbd148ba0e3361c5891027f2373aa140d42"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/OpenC3/cosmos/releases/tag/v6.10.5"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-23"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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