SecureJoin: on windows, paths outside of the rootfs could be inadvertently produced
What to do
Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/cyphar/filepath-securejoin 0.2.4), redeploy, then verify what is actually installed.
This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.
Affected packages
Go github.com/cyphar/filepath-securejoin
- Affected
- < 0.2.4
- Fixed in
- 0.2.4
Sources
- GitHub Advisory Database and maintainer security advisories on GitHub
GitHub-reviewed advisory GHSA-6xv5-86q9-7xr8 lists affected ranges: Go github.com/cyphar/filepath-securejoin >=0 <0.2.4
VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.
Severity and exploitation
- Exploitation
- No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
- CVSS
- not scored
- EPSS
- No dated EPSS signal available.
Source description
As published by the source; long descriptions are shortened.
Impact For Windows users of github.com/cyphar/filepath-securejoin, until v0.2.4 it was possible for certain rootfs and path combinations (in particular, where a malicious Unix-style /-separated unsafe path was used with a Windows-style rootfs path) to result in generated paths that were outside of the provided rootfs. It is unclear to what extent this has a practical impact on real users, but given the possible severity of the issue we have released an emergency patch release that resolves this issue. Thanks to @pjbgf for discovering, debugging, and fixing this issue (as well as writing some tests for it). Patches c121231e1276e11049547bee5ce68d5a2cfe2d9b is the patch fixing this issue. v0.2.4 contains the fix. Workarounds Users could use filepath.FromSlash() on all unsafe paths before passing them to filepath-securejoin. References See #9.
Dates and revisions
- Published by the source
- Last modified by the source
- Source last checked
- Revision 1 · created ·
Published from ghsa record GHSA-6xv5-86q9-7xr8
Agent brief
Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.
# Patch Next advisory brief: GHSA-6xv5-86q9-7xr8 Advisory: SecureJoin: on windows, paths outside of the rootfs could be inadvertently produced IDs: GHSA-6xv5-86q9-7xr8 Record: https://patchnext.com/advisories/ghsa-6xv5-86q9-7xr8 (revision 1, source checked 26 Oct 2026, 14:59 UTC) Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected. Severity: Unrated Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV. Vendor response: Vendor fix available; fixed versions by package: github.com/cyphar/filepath-securejoin 0.2.4. A vendor fix does not mean a deployment is fixed. ## Affected components - Go github.com/cyphar/filepath-securejoin: affected < 0.2.4; fixed in 0.2.4 ## Suggested inspection (read-only) - Go github.com/cyphar/filepath-securejoin: check the installed version with your package manager. ## Supported action Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version. ## Required regression checks - Run the test suite and a production build. - Exercise the features that depend on github.com/cyphar/filepath-securejoin. - Repeat the inspection and confirm that only fixed versions remain installed. ## Rollback considerations - Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward. ## Unresolved questions - Which deployments run an affected version? - Exploitation status can change. Check again before lowering the priority. - Mark the work resolved only after the fixed version is verified in production. ## Sources - Verified: https://github.com/advisories/GHSA-6xv5-86q9-7xr8 (GitHub-reviewed advisory GHSA-6xv5-86q9-7xr8 lists affected ranges: Go github.com/cyphar/filepath-securejoin >=0 <0.2.4) Commands are suggestions: review each one before running it.
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