๐Ÿ›ก๏ธ CVE-2026-40611
๐ŸŸ  CVSS 8.8 โ€” High โœ… No Known Exploit CWE-22 NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE CWE-22
Public Exploit โœ… No
Source NVD
Published 2026-04-16
Updated 2026-06-02
Modified 2026-05-05
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/go-acme/lego โ€” โ€”
github.com/go-acme/lego/v3 โ€” โ€”
github.com/go-acme/lego/v4 โ€” โ€”
unknown โ€” โ€”

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