Nixpkgs security tracker
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CVE-2026-40611
8.8 HIGH
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): Required (R)
- Scope (S): Unchanged (U)
- Confidentiality (C): High (H)
- Integrity (I): High (H)
- Availability (A): High (H)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): Required (R)
- Modified Confidentiality (MC): High (H)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): High (H)
- Modified Availability (MA): High (H)
Activity log
- Created suggestion
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 write attacker-influenced content to any path writable by the lego process. This vulnerability is fixed in 4.34.0.
References
Affected products
lego
- ==< 4.34.0
Matching in nixpkgs
pkgs.lego
Let's Encrypt client and ACME library written in Go
pkgs.haskellPackages.th-lego
Template Haskell construction utilities
Package maintainers
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@typedrat Alexis Williams <alexis@typedr.at>
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@m1cr0man Lucas Savva <lucas+nix@m1cr0man.com>
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@arianvp Arian van Putten <arian.vanputten@gmail.com>
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@aanderse Aaron Andersen <aaron@fosslib.net>
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@emilazy Emily <nixpkgs@emily.moe>