What’s Vulnerable › Vulnerabilities

CVE-2026-111130: OpenSlide through 4.0.1 Heap Out-of-Bounds Read via MIRAX get_tile_position

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-15 · updated 2026-10-21
• Weakness: CWE-125

Description

OpenSlide through 4.0.1 contains a heap out-of-bounds read vulnerability in the MIRAX reader that allows attackers to read past the slide_positions array via crafted Slidedat.ini values. Attackers can supply a MIRAX slide whose CameraImageDivisionsPerSide does not evenly divide the image counts, crashing applications that open it and corrupting tile geometry.

Affected products

• openslide: through 4.0.1

References

• https://github.com/openslide/openslide
• https://github.com/openslide/openslide/blob/fe79a9713bef2bfd64bbfefd15704060764b1274/src/openslide-vendor-mirax.c#L1033-L1034
• https://github.com/openslide/openslide/blob/fe79a9713bef2bfd64bbfefd15704060764b1274/src/openslide-vendor-mirax.c#L611-L635
• https://hackmd.io/@haind-pwn/openslide-mirax-slide-position-index-oob-read
• https://www.vulncheck.com/advisories/openslide-through-4.0.1-heap-out-of-bounds-read-via-mirax-get-tile-position
• https://hackmd.io/@haind-pwn/cve-2026-111130-openslide-mirax-slide-position-index-oob-read

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