What’s Vulnerable › Vulnerabilities

CVE-2026-48977: OpenSlide: Arbitrary memory write with crafted Ventana BIF file

• Severity: high (CVSS 7.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-09-23
• Weakness: CWE-123

Description

OpenSlide is a C library for reading whole slide image files. From 3.4.1 until 4.0.1, OpenSlide's parse_level0_xml() processing in src/openslide-vendor-ventana.c accepts nonpositive row or column tile counts from a crafted Ventana BIF file. The invalid counts produce attacker-controlled relative memory offsets and allow arbitrary values to be written at those offsets, affecting all supported platforms and configurations and resulting in a crash or potential arbitrary code execution. This issue is fixed in version 4.0.1.

Affected products

• openslide: from 3.4.1, < 4.0.1

References

• https://github.com/openslide/openslide/commit/2be88bd782d9fff46de8e56a99baca523e7917b3
• https://github.com/openslide/openslide/pull/751
• https://github.com/openslide/openslide/releases/tag/v4.0.1
• https://github.com/openslide/openslide/security/advisories/GHSA-mxg2-48g7-fmwc

Get alerted when CVE-2026-48977 or the next vulnerability affects your stack