CVE-2026-40611
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk26th percentile - higher than 26% of all known CVEs
Summary
The Let's Encrypt client and ACME library written in Go (Lego) prior to version 4.34.0 is vulnerable to arbitrary file write and deletion via path traversal in the webroot HTTP-01 challenge provider. A malicious ACME server can supply a crafted challenge token containing ../ sequences, allowing attacker-influenced content to be written to any path writable by the Lego process.
Risk Assessment
An attacker can overwrite or delete critical system files, potentially leading to privilege escalation, execution of malicious code, or full system compromise.
Recommendation
Immediately update Lego to version 4.34.0 or later, which contains the fix for this vulnerability.
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Original NVD description (English source)
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.