8.8
High
CVE-2026-40611 Let's Encrypt client and ACME library written in Go (Lego)
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| lego 4.34 | earliest → < 4.34.0 | 4.34.0 |
| Red Hat OpenShift Dev Spaces 3.28 1779786779 | earliest → < 1779786779 | 1779786779 |
References
- github.com github.com
Timeline
- Published
- Last modified