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High, CVSS 8.1amended

Evolver: Path Traversal via --out flag in fetch command allows Arbitrary File Write

CVE-2026-42075GHSA-r466-rxw4-3j9j

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@evomap/evolver 1.69.3), 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

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.1 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
EPSS
  • CVE-2026-42075: 0.64% estimated exploitation activity in the next 30 days; percentile 50.82 (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.

Summary A path traversal vulnerability in the skill download (fetch) command allows attackers to write files to arbitrary locations on the filesystem. The --out= flag accepts user-provided paths without validation, enabling directory traversal attacks that can overwrite critical system files or create files in sensitive locations. Details The vulnerability exists in index.js at lines 752-767: The outFlag.slice('--out='.length) extracts the user-provided path without any sanitization or validation. An attacker can provide paths like ../../../etc/cron.d to write files outside the intended directory. Note: The safeId variable is sanitized via inline replacement (replace(/[^a-zA-Z0-9\-\.]/g, '')), but this sanitization only applies to the default path, not to the user-provided --out= path. PoC Prerequisites: - Node.js installed - Access to the evolver application Steps to reproduce: 1. Create a test file demonstrating the vulnerability: 2. Run the test: Expected output: Actual exploit…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-r466-rxw4-3j9j

  2. Revision 1 · created ·

    Published from osv record GHSA-r466-rxw4-3j9j

Agent brief

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# Patch Next advisory brief: CVE-2026-42075

Advisory: Evolver: Path Traversal via `--out` flag in `fetch` command allows Arbitrary File Write
IDs: CVE-2026-42075, GHSA-r466-rxw4-3j9j
Record: https://patchnext.com/advisories/cve-2026-42075 (revision 2, source checked 26 Oct 2026, 12:51 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @evomap/evolver 1.69.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @evomap/evolver: affected < 1.69.3; fixed in 1.69.3

## Suggested inspection (read-only)
- `npm ls @evomap/evolver --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 @evomap/evolver.
- 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-r466-rxw4-3j9j (OSV record GHSA-r466-rxw4-3j9j lists affected ranges: npm @evomap/evolver >=0 <1.69.3 (fixed))
- Verified: https://github.com/advisories/GHSA-r466-rxw4-3j9j (GitHub-reviewed advisory GHSA-r466-rxw4-3j9j lists affected ranges: npm @evomap/evolver >=0 <1.69.3)

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