ChainerRL Visualizer 0.1.1 vulnerable to Path Traversal via unsafe use of send_file function

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L

EPSS

• CVE-2022-31573: 1.40% estimated exploitation activity in the next 30 days; percentile 72.59 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

The chainer/chainerrl-visualizer repository through 0.1.1 on GitHub allows absolute path traversal because the Flask send_file function is used unsafely.

Published by the source

12 Jul 2022, 00:00 UTC

Last modified by the source

27 Oct 2026, 16:30 UTC

Source last checked

28 Oct 2026, 06:10 UTC

1. Revision 4 · amended · 28 Oct 2026

   Amended from osv record GHSA-687h-86vc-5x59

2. Revision 3 · amended · 27 Oct 2026

   Amended from ghsa record GHSA-687h-86vc-5x59

3. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-687h-86vc-5x59

4. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-687h-86vc-5x59

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# Patch Next advisory brief: CVE-2022-31573

Advisory: ChainerRL Visualizer 0.1.1 vulnerable to Path Traversal via unsafe use of send_file function
IDs: CVE-2022-31573, GHSA-687h-86vc-5x59
Record: https://patchnext.com/advisories/cve-2022-31573 (revision 4, source checked 28 Oct 2026, 06:10 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI chainerrl-visualizer: affected <= 0.1.1

## Suggested inspection (read-only)
- `python -m pip show chainerrl-visualizer`: prints the installed version. Run with the environment that serves production active.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on chainerrl-visualizer.
- 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-687h-86vc-5x59 (OSV record GHSA-687h-86vc-5x59 lists affected ranges: PyPI chainerrl-visualizer >=0 <=0.1.1)
- Verified: https://github.com/advisories/GHSA-687h-86vc-5x59 (GitHub-reviewed advisory GHSA-687h-86vc-5x59 lists affected ranges: PyPI chainerrl-visualizer >=0 <=0.1.1)

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