Weakness Type (CWE)

CWE-22 — CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CAPEC

CVSS 4.0 Score

6.9

MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Vulnerability description

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.

Affected

pkg:github/hexpm/hexpm

Module Source File Routine
Hexpm.Store.Local lib/hexpm/store/local.ex Hexpm.Store.Local.get/3
Hexpm.Store.Local.put/4
Hexpm.Store.Local.delete/2
Hexpm.Store.Local.delete_many/2
Status Type Version Changes / Fixed in
affected git ⓘ 931ee0ed46fa < 5d2ccd2f14f4

Workarounds

  • 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.

References

Credits

  • Finder: Michael Lubas / Paraxial.io
  • Remediation developer: Jonatan Männchen / EEF
  • Remediation reviewer: Eric Meadows-Jönsson / Hex.pm

CVE record as JSON:  GET /cves/CVE-2026-23939.json
OSV record as JSON:  GET /osv/EEF-CVE-2026-23939.json