EEF-CVE-2026-23939

Summary

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in hexpm hexpm/hexpm ('Elixir.Hexpm.Store.Local' module) allows Relative Path Traversal. This vulnerability is associated with program files lib/hexpm/store/local.ex and program routines 'Elixir.Hexpm.Store.Local':get/3, 'Elixir.Hexpm.Store.Local':put/4, 'Elixir.Hexpm.Store.Local':delete/2, 'Elixir.Hexpm.Store.Local':delete_many/2.

This issue does NOT affect hex.pm the service. Only self-hosted deployments using the Local Storage backend are affected.

This issue affects hexpm: from 931ee0ed46fa89218e0400a4f6e6d15f96406050 before 5d2ccd2f14f45a63225a73fb5b1c937baf36fdc0.

Workaround

• Avoid the local file store backend in any exposed environment.
• Restrict network access to the registry when using the local backend.
• Production deployments should use object storage (e.g., S3-compatible backends) instead of the local filesystem store.

Configuration

Only self-hosted hexpm deployments using the Hexpm.Store.Local storage backend are affected. The hex.pm service and deployments using S3-compatible object storage backends are not affected.