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CVE-2026-35520— Pi-hole FTL affected by Remote Code Execution (RCE) via dhcp.leaseTime Newline Injection

Quick assessment

Affected
pi-hole FTL
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FTL是Pi-hole开源的一个网络广告拦截与统计工具。 FTL 6.0至6.6之前版本存在注入漏洞，该漏洞源于DHCP租约时间配置参数存在注入漏洞，可能导致经过身份验证的攻击者通过换行符注入任意dnsmasq配置指令，最终在底层系统上执行命令。

CVSS 8.8 · High EPSS 0.70% · P50

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-35520

Vulnerability Information
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Vulnerability Title
Pi-hole FTL affected by Remote Code Execution (RCE) via dhcp.leaseTime Newline Injection
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
FTL 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FTL是Pi-hole开源的一个网络广告拦截与统计工具。 FTL 6.0至6.6之前版本存在注入漏洞，该漏洞源于DHCP租约时间配置参数存在注入漏洞，可能导致经过身份验证的攻击者通过换行符注入任意dnsmasq配置指令，最终在底层系统上执行命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pi-hole FTL >= 6.0, < 6.6 -

II. Public POCs for CVE-2026-35520

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III. Intelligence Information for CVE-2026-35520

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Vendor Advisories for CVE-2026-35520 (1)

Same Patch Batch · pi-hole · 2026-04-07 · 6 CVEs total

CVE-2026-35517 8.8 HIGH Pi-hole FTL affected by Remote Code Execution (RCE) via dns.upstreams Newline Injection
CVE-2026-35518 8.8 HIGH Pi-hole FTL affected by Remote Code Execution (RCE) via dns.cnameRecords Newline Injection
CVE-2026-35521 8.8 HIGH Pi-hole FTL affected by Remote Code Execution (RCE) via dhcp.hosts Newline Injection
CVE-2026-35519 8.8 HIGH Pi-hole FTL affected by Remote Code Execution (RCE) via dns.hostRecord Newline Injection
CVE-2026-35491 6.1 MEDIUM Pi-hole FTL: CLI API sessions can import Teleporter archives and modify configuration

IV. Related Vulnerabilities

Same product: FTL
Same vendor: pi-hole
Same weakness: CWE-78

V. Comments for CVE-2026-35520

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