DEBIAN-CVE-2026-40611

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Source
https://security-tracker.debian.org/tracker/CVE-2026-40611
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40611.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-40611
Upstream
Published
2026-04-21T18:16:52Z
Modified
2026-09-14T17:03:11Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:12 / golang-github-xenolf-lego

Package

Name
golang-github-xenolf-lego
Purl
pkg:deb/debian/golang-github-xenolf-lego?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.9.1-1
4.9.1-2
4.9.1-3
4.9.1-4
4.35.2-1
4.35.2-2~bpo13+1
4.35.2-2
4.35.2-3~bpo13+1
4.35.2-3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40611.json"

Debian:13 / golang-github-xenolf-lego

Package

Name
golang-github-xenolf-lego
Purl
pkg:deb/debian/golang-github-xenolf-lego?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.9.1-2
4.9.1-3
4.9.1-4
4.35.2-1
4.35.2-2~bpo13+1
4.35.2-2
4.35.2-3~bpo13+1
4.35.2-3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40611.json"

Debian:14 / golang-github-xenolf-lego

Package

Name
golang-github-xenolf-lego
Purl
pkg:deb/debian/golang-github-xenolf-lego?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.35.2-1

Affected versions

4.*
4.9.1-2
4.9.1-3
4.9.1-4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40611.json"