# CVE-2026-48977: openslide: OpenSlide is a C library for reading whole slide image files

CVE-2026-48977 is fixed in openslide on 1 platform, first by DEBIAN-CVE-2026-48977, released June 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-48977
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0048
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 17, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | openslide Debian 12.15 (bookworm) | 3.4.1+dfsg-6+deb12u1 | [DEBIAN-CVE-2026-48977](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48977.md) | Jun 24, 2026 |
| Linux | openslide Debian 13.5 (trixie) | 3.4.1+dfsg-7+deb13u1 | [DEBIAN-CVE-2026-48977](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48977.md) | Jun 24, 2026 |
| Linux | openslide Debian 14 | 3.4.1+dfsg-9 | [DEBIAN-CVE-2026-48977](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48977.md) | Jun 24, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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