Service interrupt via malformed GeoJSON coordinates
Published Aug 18, 2026 · Updated Aug 18, 2026
Out-of-bounds read and NULL pointer dereference in KNMI Adaguc-server before 7.2.2 allow attackers to crash server via malformed GeoJSON coordinates. In adagucserverEC/CConvertGeoJSON.cpp, the GeoJSON parser reads pt.u.array.values[0] and [1] and iterates on polygon.u.array.length without checking that inner JSON nodes are arrays with at least two elements. Exposure requires a crafted GeoJSON file to be present in a configured dataset or AutoResource directory; an unauthenticated WMS request can then terminate only the backend subprocess handling that request, returning HTTP 500 rather than stopping the parent worker.
Summary
What happened
Out-of-bounds read and NULL pointer dereference in KNMI Adaguc-server before 7.2.2 allow attackers to crash server via malformed GeoJSON coordinates. In adagucserverEC/CConvertGeoJSON.cpp, the GeoJSON parser reads pt.u.array.values[0] and [1] and iterates on polygon.u.array.length without checking that inner JSON nodes are arrays with at least two elements. Exposure requires a crafted GeoJSON file to be present in a configured dataset or AutoResource directory; an unauthenticated WMS request can then terminate only the backend subprocess handling that request, returning HTTP 500 rather than stopping the parent worker.
The record
- CVE
- CVE-2026-50126
- Published
- Aug 18, 2026
- Updated
- Aug 18, 2026
- Vendor
- KNMI
- Product
- Adaguc-server
- Classifications
- CWE-476, CWE-125, T1499
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Aug 18, 2026CVE publishedPublication date reported by the CVE source.
- Aug 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 7.2.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA malformed GeoJSON crash proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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