CVE-2026-50126 Null dereference in adaguc-server
An attacker can crash the adaguc-server backend by sending a crafted GeoJSON file via an unauthenticated WMS request, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-50126?
CVE-2026-50126 is a medium-severity vulnerability in KNMI adaguc-server, published on 18 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Adaguc-server is an open source geographical information system to visualize, combine, compare and share real-time meteorological, climatological and remote sensing data via OGC standards. Versions prior to 7.2.2 crash with a memory-safety fault when it parses a GeoJSON document whose geometry contains a malformed coordinate. The coordinate parser in `adagucserverEC/CConvertGeoJSON.cpp` indexes `pt.u.array.values[0]` and `pt.u.array.values[1]` and uses `polygon.u.array.length` as a loop bound without first validating the JSON node type or the coordinate length. A coordinate that is an empty array, a one-element array, a scalar, or `null` leads to an out-of-bounds heap read or a NULL pointer dereference. The same unchecked pattern is present in four geometry branches: `Polygon`, `LineString`, `MultiLineString` and `MultiPolygon`. The vulnerable parser runs whenever the server processes a local GeoJSON file, either a configured GeoJSON dataset or a GeoJSON file exposed through the `AutoResource` feature and requested by an unauthenticated WMS request. A crafted GeoJSON file reliably crashes the backend process that handles that request. Version 7.2.2 patches the vulnerability.
Which versions are affected by CVE-2026-50126?
How do I fix CVE-2026-50126?
No fix has been published for CVE-2026-50126 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-50126 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-50126 exists.
Sources
Also known as GHSA-mwgv-59vv-rp2m.