gramps-webapi: Zip Slip Path Traversal in Media Archive Import

Exploitation

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

CVSS

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

EPSS

• CVE-2026-40258: 0.40% estimated exploitation activity in the next 30 days; percentile 34.36 (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.

Summary A path traversal vulnerability (Zip Slip) exists in the media archive import feature. An authenticated user with owner-level privileges can craft a malicious ZIP file with directory-traversal filenames to write arbitrary files outside the intended temporary extraction directory on the server's local filesystem.

Details When importing media archives as ZIP file, `MediaImporter._check_disk_space_and_extract()` in `gramps_webapi/api/media_importer.py` called `zipfile.extractall()` without validating ZIP entry names. Python's `zipfile` module does not sanitize entry names containing `../` sequences, allowing extraction to paths outside the target directory. Only users with owner permission can upload media ZIP archives, so the biggest risk is for multi-tree deployments, where tree owners are distinct from server administrators. For multi-tree deployments, the impact depends on deployment configuration. Assuming the standard docker-based deployment is used: - **SQLite…

Published by the source

10 Apr 2026, 21:00 UTC

Last modified by the source

27 Oct 2026, 16:45 UTC

Source last checked

28 Oct 2026, 06:10 UTC

1. Revision 5 · amended · 28 Oct 2026

   Amended from osv record GHSA-m5gr-86j6-99jp

2. Revision 4 · amended · 27 Oct 2026

   Amended from ghsa record GHSA-m5gr-86j6-99jp

3. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-m5gr-86j6-99jp

4. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-m5gr-86j6-99jp

5. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-m5gr-86j6-99jp

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# Patch Next advisory brief: CVE-2026-40258

Advisory: gramps-webapi: Zip Slip Path Traversal in Media Archive Import
IDs: CVE-2026-40258, GHSA-m5gr-86j6-99jp
Record: https://patchnext.com/advisories/cve-2026-40258 (revision 5, 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 9.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: gramps-webapi 3.11.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI gramps-webapi: affected >= 1.6.0, < 3.11.1; fixed in 3.11.1

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

## 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 gramps-webapi.
- 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-m5gr-86j6-99jp (GitHub-reviewed advisory GHSA-m5gr-86j6-99jp lists affected ranges: PyPI gramps-webapi >=1.6.0 <=3.11.0)
- Verified: https://osv.dev/vulnerability/GHSA-m5gr-86j6-99jp (OSV record GHSA-m5gr-86j6-99jp lists affected ranges: PyPI gramps-webapi >=1.6.0 <3.11.1 (fixed))

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