CVE-2026-123368 (GCVE-0-2026-123368)

Vulnerability from cvelistv5 – Published: 2026-11-09 17:25 – Updated: 2026-11-09 17:25
VLAI
Title
compose-lint: .env read through a symlink outside the project can expose the CI job's environment
Summary
compose-lint is a Docker Compose security linter that identifies dangerous misconfigurations before deployment. From 0.22.0 until 0.31.0, compose-lint follows a sibling .env symbolic link outside the project without applying its normal containment check. From 0.28.0, the same gap also affects an include project_directory link outside the project. A pull request can reference a variable from the linked file, causing substitution to place runner file or process-environment data into finding messages written to logs, JSON, SARIF artifacts, and Code Scanning alerts. Reading /proc/self/environ can expose the remainder of the linter process environment because NUL-separated entries are treated as one value, although disclosure requires a workflow that processes untrusted changes with useful environment data and GitHub normally withholds secrets from fork pull requests. The pass or fail result is not changed. This issue is fixed in version 0.31.0.
Severity
2.3 (Low)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
tmatens compose-lint Affected: >= 0.22.0, < 0.31.0
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "compose-lint",
          "vendor": "tmatens",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.22.0, \u003c 0.31.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "compose-lint is a Docker Compose security linter that identifies dangerous misconfigurations before deployment. From 0.22.0 until 0.31.0, compose-lint follows a sibling .env symbolic link outside the project without applying its normal containment check. From 0.28.0, the same gap also affects an include project_directory link outside the project. A pull request can reference a variable from the linked file, causing substitution to place runner file or process-environment data into finding messages written to logs, JSON, SARIF artifacts, and Code Scanning alerts. Reading /proc/self/environ can expose the remainder of the linter process environment because NUL-separated entries are treated as one value, although disclosure requires a workflow that processes untrusted changes with useful environment data and GitHub normally withholds secrets from fork pull requests. The pass or fail result is not changed. This issue is fixed in version 0.31.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 2.3,
            "baseSeverity": "LOW",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-22",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-59",
              "description": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-09T17:25:15.559Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/tmatens/compose-lint/security/advisories/GHSA-6wcv-rj3c-mhv3",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/tmatens/compose-lint/security/advisories/GHSA-6wcv-rj3c-mhv3"
        },
        {
          "name": "https://github.com/tmatens/compose-lint/pull/917",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/tmatens/compose-lint/pull/917"
        },
        {
          "name": "https://github.com/tmatens/compose-lint/commit/c43204ad4dab11d54e20574a52bc4e5835246ca5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/tmatens/compose-lint/commit/c43204ad4dab11d54e20574a52bc4e5835246ca5"
        },
        {
          "name": "https://github.com/tmatens/compose-lint/releases/tag/v0.31.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/tmatens/compose-lint/releases/tag/v0.31.0"
        }
      ],
      "source": {
        "advisory": "GHSA-6wcv-rj3c-mhv3",
        "discovery": "UNKNOWN"
      },
      "title": "compose-lint: .env read through a symlink outside the project can expose the CI job\u0027s environment"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-123368",
    "datePublished": "2026-11-09T17:25:15.559Z",
    "dateReserved": "2026-11-05T20:43:10.420Z",
    "dateUpdated": "2026-11-09T17:25:15.559Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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