OpenSlide up to 4.0.0 BIF file openslide-vendor-ventana.c parse_level0_xml buffer overflow

Summaryinfo

A vulnerability described as critical has been identified in OpenSlide up to 4.0.0. The impacted element is the function parse_level0_xml of the file src/openslide-vendor-ventana.c of the component BIF file Handler. Executing a manipulation can lead to buffer overflow. This vulnerability is tracked as CVE-2026-48977. The attack can be launched remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in OpenSlide up to 4.0.0. This vulnerability affects the function parse_level0_xml of the file src/openslide-vendor-ventana.c of the component BIF file Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-48977 since 05/27/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 4.0.1 eliminates this vulnerability.

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Productinfo

Name

• OpenSlide

Version

• 4.0

Website

• Product: https://github.com/openslide/openslide/

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