CVE-2026-40258 Gramps Web API has Zip Slip Path Traversal in Media Archive Import
Authenticated owners can exploit Zip Slip in media import to write arbitrary files outside the intended directory, requiring an upgrade to fix.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-40258?
CVE-2026-40258 is a critical path traversal vulnerability in gramps-project gramps-web-api, published on 17 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
The Gramps Web API is a Python REST API for the genealogical research software Gramps. Versions 1.6.0 through 3.11.0 have a path traversal vulnerability (Zip Slip) 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. Startig in version 3.11.1, ZIP entry names are now validated against the resolved real path of the temporary directory before extraction. Any entry whose resolved path falls outside the temporary directory raises an error and aborts the import.
Weakness: CWE-22
Which versions are affected by CVE-2026-40258?
3 open source packages ship an affected version, including gramps-webapi.
| Package | Affected | Fixed in |
|---|---|---|
gramps-webapi PyPI | From 1.6.0 | 3.11.1 |
gramps-webapi PyPI | From 1.6.0 | 3.11.1 |
gramps-webapi PyPI | From 1.6.0 | 3.11.1 |
How do I fix CVE-2026-40258?
Upgrade gramps-webapi to 3.11.1 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-40258 being exploited?
There is no known exploitation of CVE-2026-40258 in the wild and no public exploit code.
Sources
Also known as GHSA-m5gr-86j6-99jp, PYSEC-2026-346.