CVE-2026-35517

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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/pi-hole/FTL/security/advisories/GHSA-23w8-7333-p9fj	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:pi-hole:ftldns:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-04-07 16:16

Updated : 2026-06-17 10:40

NVD link : CVE-2026-35517

Mitre link : CVE-2026-35517

CVE.ORG link : CVE-2026-35517

JSON object : View

Products Affected

pi-hole

ftldns

CWE

CWE-78

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CWE-93

Improper Neutralization of CRLF Sequences ('CRLF Injection')

{"id": "CVE-2026-35517", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-35517", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-04-07T18:19:40.630593Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "pi-hole", "product": "FTL", "versions": [{"status": "affected", "version": ">= 6.0, < 6.6"}]}]}], "published": "2026-04-07T16:16:28.093", "references": [{"url": "https://github.com/pi-hole/FTL/security/advisories/GHSA-23w8-7333-p9fj", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-78"}, {"lang": "en", "value": "CWE-93"}]}], "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."}], "lastModified": "2026-06-17T10:40:42.877", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:pi-hole:ftldns:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8C927FF0-74A4-4F13-95A8-E80C5E80F607", "versionEndIncluding": "6.5", "versionStartIncluding": "6.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}