Quick answers
- Is CVE-2026-9535 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-9535 being exploited in the wild.
- How severe is CVE-2026-9535?
- High severity, with a CVSS score of 8.2, published 29 October 2026.
- Which products and versions are affected?
- Kitware VTK 9.6.1.
- Is there a fix for CVE-2026-9535?
- Yes: fixed in VTK 9.6.2, 9.7.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-9535 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-9535?
- Check whether you run Kitware VTK at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: VTK 9.6.2, 9.7.1
Technical details
An out-of-bounds read (CWE-125) exists in vtkChacoReader::InputGraph2(), which parses Chaco plain-text graph format files. The vulnerability occurs because neighbor vertex IDs read from the .graph file are never validated to fall within the valid range [1, nvtxs] before being stored in the connectivity array. When GetCell() later attempts to retrieve point coordinates using these unchecked IDs as indices, a heap buffer over-read occurs.
Affected products
- Kitware VTK 9.6.1
Timeline
- 2026-10-29: disclosed