CVE-2026-40611— Lego: Arbitrary File Write via Path Traversal in Webroot HTTP-01 Provider
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I. Basic Information for CVE-2026-40611
Vulnerability Information
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Vulnerability Title
Lego: Arbitrary File Write via Path Traversal in Webroot HTTP-01 Provider
Source: NVD (National Vulnerability Database)
Vulnerability Description
Let's Encrypt client and ACME library written in Go (Lego). Prior to 4.34.0, the webroot HTTP-01 challenge provider in lego is vulnerable to arbitrary file write and deletion via path traversal. A malicious ACME server can supply a crafted challenge token containing ../ sequences, causing lego to write attacker-influenced content to any path writable by the lego process. This vulnerability is fixed in 4.34.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Lego 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Lego是go-acme开源的一个用Go编写的库。 Lego 4.34.0之前版本存在安全漏洞，该漏洞源于webroot HTTP-01质询提供程序存在路径遍历，可能导致任意文件写入和删除。
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
II. Public POCs for CVE-2026-40611
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IV. Related Vulnerabilities
Same product: lego
Same vendor: go-acme
Same weakness: CWE-22
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