# CVE-2026-111130: OpenSlide heap out-of-bounds read in MIRAX reader

Source: https://junglewise.ai/threats/cve-2026-111130-openslide-through-4-0-1-contains-a-heap-out-of-bounds-read  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-15. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-111130 · Severity: medium · CVSS 6.1 · Published 2026-10-15

OpenSlide is a C library used to read digital pathology slide images from medical imaging systems. A flaw in its MIRAX reader allows an attacker to craft a malicious slide file that crashes applications opening it, potentially disrupting diagnostic workflows or corrupting tile geometry. The vulnerability cannot be exploited remotely but requires a user to open a crafted slide file.

Technologies: [OpenSlide](https://junglewise.ai/threats/technologies/openslide). Vendors: [OpenSlide](https://junglewise.ai/threats/vendors/openslide).

## Quick answers

**Is CVE-2026-111130 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-111130 being exploited in the wild.

**How severe is CVE-2026-111130?** Medium severity, with a CVSS score of 6.1, published 15 October 2026.

**Which products and versions are affected?** OpenSlide through 4.0.1.

**Is there a fix for CVE-2026-111130?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-111130 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-111130?** Check whether you run OpenSlide 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.

## Technical details

The vulnerability is a heap out-of-bounds read in the MIRAX reader component, triggered when a crafted Slidedat.ini file contains a CameraImageDivisionsPerSide value that does not evenly divide the image counts, causing the reader to access memory beyond the slide_positions array. An attacker must supply a malicious MIRAX slide file; the application crashes upon opening it and tile geometry becomes corrupted. The fix is available in versions after 4.0.1.

## Affected products

- OpenSlide OpenSlide through 4.0.1

## Timeline

- 2026-10-15: disclosed

## References

- [https://github.com/](https://github.com/)
- [https://github.com/openslide/openslide](https://github.com/openslide/openslide)

## Related threats

- [OpenSlide uninitialized memory disclosure in TIFF decoding](https://junglewise.ai/threats/cve-2026-54604-openslide-uninitialized-memory-disclosure-in-tiff-decoding)
- [OpenSlide buffer overflow in Ventana BIF file parsing](https://junglewise.ai/threats/cve-2026-48977-openslide-buffer-overflow-in-ventana-bif-file-parsing)