Arbitrary File Write And Deletion

github.com/go-acme/lego is vulnerable to arbitrary file write and deletion. The vulnerability is due to improper validation of the HTTP-01 challenge token in the webroot challenge provider, which allows a malicious ACME server to supply crafted ../ path traversal sequences and write or delete fil...

CVE-2026-40611

A flaw was found in lego, the Let's Encrypt client and ACME library written in Go. A malicious ACME Automated Certificate Management Environment server can exploit a path traversal vulnerability in the webroot HTTP-01 challenge provider. By supplying a specially crafted challenge token containing...

Directory Traversal

Overview Affected versions of this package are vulnerable to Directory Traversal via the Webroot HTTP-01 challenge provider. An attacker can write arbitrary files to the filesystem by supplying crafted challenge tokens containing directory traversal sequences. Details A Directory Traversal attack...

Directory Traversal

Overview Affected versions of this package are vulnerable to Directory Traversal via the Webroot HTTP-01 challenge provider. An attacker can write arbitrary files to the filesystem by supplying crafted challenge tokens containing directory traversal sequences. Details A Directory Traversal attack...

DEBIAN-CVE-2026-40611

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...

CVE-2026-40611

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...

CVE-2026-40611 Lego: Arbitrary File Write via Path Traversal in Webroot HTTP-01 Provider

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...

CVE-2026-40611

Technical details about CVE-2026-40611 are not publicly available in the provided documents; these sources confirm the vulnerability description but do not include affected versions, specifics, exploit status, or patches. Monitor for updates.

CVE-2026-40611

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...