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

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Dated risk observations

Risk history is separate from CNA/OSV content history. Daily score drift is retained but only an upward crossing of 10% triggers the prediction change event.

Immutable source observations

6 recorded revisions

Each citation identifies one complete source statement. Source modification dates and the time this installation observed them are distinct. Latest history includes records historically associated by source identifiers; a removed alias is not a current equivalence claim. Exact citations show that source record's own earlier observations. Failed reads and unchanged polls do not rewrite history.

28 Oct 2026 05:02:34 UTC

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 …

euvd · EUVD-2026-24219 · Published

27 Oct 2026 10:10:07 UTC

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 …

nvd · CVE-2026-40611 · Published

25 Oct 2026 09:17:30 UTC

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 …

nvd · CVE-2026-40611 · Published

24 Oct 2026 13:19:41 UTC

ACME Lego: Arbitrary File Write via Path Traversal in Webroot HTTP-01 Provider

osv · GHSA-qqx8-2xmm-jrv8 · Published

24 Oct 2026 13:19:41 UTC

ACME Lego: Arbitrary File Write via Path Traversal in Webroot HTTP-01 Provider in github.com/go-acme/lego

osv · GO-2026-5593 · Published

23 Oct 2026 15:48:27 UTC

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

cve-program · CVE-2026-40611 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 30 Oct 01:01 UTC · 272 of 272 readable · 271 fully read · documentation 468/469 current