GHSA-65RG-554R-9J5X

Vulnerability from github – Published: 2025-08-28 14:40 – Updated: 2025-08-28 15:59
VLAI?
Summary
lychee link checking action affected by arbitrary code injection in composite action
Details

Summary

There is a potential attack of arbitrary code injection vulnerability in lychee-setup of the composite action at action.yml.

Details

The GitHub Action variable inputs.lycheeVersion can be used to execute arbitrary code in the context of the action.

PoC

- uses: lycheeverse/lychee@v2
  with:
    lycheeVersion: $(printenv >> $GITHUB_STEP_SUMMARY && echo "v0.16.1")

The previous example will just print all the environment variables to the summary of the workflow, but an attacker could potentially use this vector to compromise the security of the target repository, even passing unnotice because the action will run normally.

Impact

Low

Severity ?
6.9 (Medium)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
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{
  "affected": [
    {
      "package": {
        "ecosystem": "GitHub Actions",
        "name": "lycheeverse/lychee-action"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-48908"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-08-28T14:40:08Z",
    "nvd_published_at": "2025-08-28T15:15:42Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nThere is a potential attack of arbitrary code injection vulnerability in `lychee-setup` of the composite action at *action.yml*.\n\n### Details\n\nThe GitHub Action variable `inputs.lycheeVersion` can be used to execute arbitrary code in the context of the action.\n\n### PoC\n\n```yaml\n- uses: lycheeverse/lychee@v2\n  with:\n    lycheeVersion: $(printenv \u003e\u003e $GITHUB_STEP_SUMMARY \u0026\u0026 echo \"v0.16.1\")\n```\n\nThe previous example will just print all the environment variables to the summary of the workflow, but an attacker could potentially use this vector to compromise the security of the target repository, even passing unnotice because the action will run normally.\n\n### Impact\n\nLow",
  "id": "GHSA-65rg-554r-9j5x",
  "modified": "2025-08-28T15:59:37Z",
  "published": "2025-08-28T14:40:08Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/lycheeverse/lychee-action/security/advisories/GHSA-65rg-554r-9j5x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-48908"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lycheeverse/lychee-action/commit/7cd0af4c74a61395d455af97419279d86aafaede"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/lycheeverse/lychee-action"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "lychee link checking action affected by arbitrary code injection in composite action"
}


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