CVE-2026-20699

#!/usr/bin/env python3 """ Conceptual PoC for CVE-2026-20699 Verification This script checks if the macOS version is vulnerable to the downgrade attack. Note: This does not exploit the vulnerability but checks the OS version. """ import platform import subprocess def get_macos_version(): """Get the current macOS version.""" return platform.mac_ver()[0] def is_vulnerable(version): """ Check if the version is within the vulnerable range. Vulnerable: macOS Sequoia < 15.7.5, macOS Sonoma < 14.8.5, macOS Tahoe < 26.3 """ # Simplified logic for demonstration major, minor, patch = map(int, version.split('.')) if major == 15 and minor < 7: return True if major == 15 and minor == 7 and patch < 5: return True if major == 14 and minor < 8: return True if major == 14 and minor == 8 and patch < 5: return True if major == 26 and minor < 3: return True return False if __name__ == "__main__": current_ver = get_macos_version() print(f"Current macOS Version: {current_ver}") if is_vulnerable(current_ver): print("[!] System is potentially vulnerable to CVE-2026-20699.") else: print("[+] System appears to be patched or unaffected.")

{"cve": {"id": "CVE-2026-20699", "sourceIdentifier": "[email protected]", "published": "2026-03-25T01:17:06.650", "lastModified": "2026-03-25T18:27:09.003", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A downgrade issue affecting Intel-based Mac computers was addressed with additional code-signing restrictions. This issue is fixed in macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.3, macOS Tahoe 26.4. An app may be able to access user-sensitive data."}, {"lang": "es", "value": "Un problema de downgrade que afectaba a los ordenadores Mac basados en Intel se abordó con restricciones adicionales de firma de código. Este problema está solucionado en macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.3, macOS Tahoe 26.4. Una aplicación podría acceder a datos sensibles del usuario."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 6.2, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.5, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-347"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "versionStartIncluding": "14.0", "versionEndExcluding": "14.8.5", "matchCriteriaId": "D66288AF-23BD-407A-81F5-F1DFBF84C622"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "versionStartIncluding": "15.0", "versionEndExcluding": "15.7.5", "matchCriteriaId": "DD21D2C9-BBEC-4E8E-B8D2-C92B7E6155E1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "versionStartIncluding": "26.0", "versionEndExcluding": "26.3", "matchCriteriaId": "0488A377-7971-4703-8823-05BF1E23CF48"}]}]}], "references": [{"url": "https://support.apple.com/en-us/126348", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/126794", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/126795", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://support.apple.com/en-us/126796", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}]}}