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CVE-2026-35491— Pi-hole FTL: CLI API sessions can import Teleporter archives and modify configuration

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之前版本存在安全漏洞，该漏洞源于/api/teleporter允许CLI会话进行Teleporter导入，可能导致CLI范围的会话通过Teleporter存档覆盖配置，从而绕过授权。

CVSS 6.1 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token
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I. Basic Information for CVE-2026-35491

Vulnerability Information
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Vulnerability Title
Pi-hole FTL: CLI API sessions can import Teleporter archives and modify configuration
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, Pi-hole FTL supports a CLI password feature (webserver.api.cli_pw) that creates “CLI” API sessions intended to be read-only for configuration changes. While /api/config correctly blocks CLI sessions from mutating configuration, /api/teleporter allowed Teleporter imports for CLI sessions, enabling a CLI-scoped session to overwrite configuration via a Teleporter archive (authorization bypass). This vulnerability is fixed in 6.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
FTL 安全漏洞
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之前版本存在安全漏洞，该漏洞源于/api/teleporter允许CLI会话进行Teleporter导入，可能导致CLI范围的会话通过Teleporter存档覆盖配置，从而绕过授权。
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-2026-35491

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III. Intelligence Information for CVE-2026-35491

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

CVE-2026-35520 8.8 HIGH Pi-hole FTL affected by Remote Code Execution (RCE) via dhcp.leaseTime Newline Injection
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

IV. Related Vulnerabilities

Same product: FTL
Same vendor: pi-hole
Same weakness: CWE-863

V. Comments for CVE-2026-35491

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