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High, CVSS 8.7amended

tar-fs has a symlink validation bypass if destination directory is predictable with a specific tarball

CVE-2025-59343GHSA-vj76-c3g6-qr5v

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (tar-fs 3.1.1, 2.1.4, 1.16.6), 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.

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Affected packages

  • npm tar-fs

    Affected
    >= 3.0.0, < 3.1.1>= 2.0.0, < 2.1.4< 1.16.6
    Fixed in
    1.16.6, 3.1.1, 2.1.4

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2025-59343: 0.55% estimated exploitation activity in the next 30 days; percentile 46.23 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact v3.1.0, v2.1.3, v1.16.5 and below Patches Has been patched in 3.1.1, 2.1.4, and 1.16.6 Workarounds You can use the ignore option to ignore non files/directories. Credit Reported by: Mapta / BugBunnyai

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-vj76-c3g6-qr5v

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-vj76-c3g6-qr5v

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2025-59343

Advisory: tar-fs has a symlink validation bypass if destination directory is predictable with a specific tarball
IDs: CVE-2025-59343, GHSA-vj76-c3g6-qr5v
Record: https://patchnext.com/advisories/cve-2025-59343 (revision 3, source checked 26 Oct 2026, 12:38 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: tar-fs 3.1.1, 2.1.4, 1.16.6. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm tar-fs: affected >= 3.0.0, < 3.1.1; >= 2.0.0, < 2.1.4; < 1.16.6; fixed in 1.16.6, 3.1.1, 2.1.4

## Suggested inspection (read-only)
- `npm ls tar-fs --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## 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 tar-fs.
- 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://osv.dev/vulnerability/GHSA-vj76-c3g6-qr5v (OSV record GHSA-vj76-c3g6-qr5v lists affected ranges: npm tar-fs >=3.0.0 =2.0.0 =0 <1.16.6 (fixed))
- Verified: https://github.com/advisories/GHSA-vj76-c3g6-qr5v (GitHub-reviewed advisory GHSA-vj76-c3g6-qr5v lists affected ranges: npm tar-fs >=3.0.0 =2.0.0 =0 <1.16.6)

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