golang-github-xenolf-lego: Let's Encrypt client and ACME library written in Go (Lego)
CVE-2026-40611 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-40611, released April 21, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| golang-github-xenolf-lego · Debian 14 | 4.35.2-1 | DEBIAN-CVE-2026-40611 | Apr 21, 2026 |
| govulncheck-vulndb · opensuse-leap 16.0 | 0.0.20260727T201416-160000.1.1 | OPENSUSE-SU-2026:21551-1 | Aug 10, 2026 |
| govulncheck-vulndb · sles 16.0 | 0.0.20260727T201416-160000.1.1 | SUSE-SU-2026:23227-1 | Aug 10, 2026 |
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