Write-what-where Condition Affecting openslide package, versions <3.4.1+dfsg-6+deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published16 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
CVE-2026-48977 (opens in a new tab)How to fix?
Upgrade Echo:latest openslide to version 3.4.1+dfsg-6+deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openslide package and not the openslide package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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.
References
- https://advisory.echohq.com/cve/CVE-2026-48977
- 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