CVE-2026-7009

#!/usr/bin/env python3 # PoC for CVE-2026-7009: curl OCSP stapling validation bypass # This script demonstrates how to check if a target accepts a revoked certificate via OCSP stapling. # Note: Requires a server configured with a revoked certificate and OCSP stapling. import subprocess import sys def check_ocsp_stapling(url): print(f"[*] Testing {url} for CVE-2026-7009...") # Using curl with verbose output to check OCSP response # --staple-ocsp enables OCSP stapling try: result = subprocess.run( ['curl', '-vI', '--staple-ocsp', url], capture_output=True, text=True, timeout=10 ) print("[+] Output:") print(result.stderr) print(result.stdout) # In a vulnerable scenario, curl might connect successfully despite invalid OCSP if "SSL certificate verify ok" in result.stderr: print("[!] Potential vulnerability: Connection accepted despite OCSP issues.") else: print("[-] Connection refused or verification failed.") except Exception as e: print(f"Error: {e}") if __name__ == "__main__": if len(sys.argv) < 2: print("Usage: python3 poc.py <https://target-url>") else: check_ocsp_stapling(sys.argv[1])

{"cve": {"id": "CVE-2026-7009", "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9", "published": "2026-05-13T13:01:57.100", "lastModified": "2026-05-14T14:17:05.223", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "When curl is told to use the Certificate Status Request TLS extension, often\nreferred to as *OCSP stapling*, to verify that the server certificate is\nvalid, it fails to detect OCSP problems and instead wrongly consider the\nresponse as fine."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-295"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.17.0", "versionEndExcluding": "8.20.0", "matchCriteriaId": "6B99D3F9-89CA-45D0-BFA6-128FB2596B07"}]}]}], "references": [{"url": "https://curl.se/docs/CVE-2026-7009.html", "source": "2499f714-1537-4658-8207-48ae4bb9eae9", "tags": ["Patch", "Vendor Advisory"]}, {"url": "https://curl.se/docs/CVE-2026-7009.json", "source": "2499f714-1537-4658-8207-48ae4bb9eae9", "tags": ["Product"]}, {"url": "https://hackerone.com/reports/3694390", "source": "2499f714-1537-4658-8207-48ae4bb9eae9", "tags": ["Exploit", "Issue Tracking", "Patch"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/29/12", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch", "Third Party Advisory"]}, {"url": "https://hackerone.com/reports/3694390", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Issue Tracking", "Patch"]}]}}