OpenSlide up to 4.0.0 TIFF Tile Decoder openslide-decode-tiff.c _openslide_tiff_read_tile uninitialized resource

Summaryinfo

A vulnerability marked as critical has been reported in OpenSlide up to 4.0.0. The affected element is the function _openslide_tiff_read_tile of the file src/openslide-decode-tiff.c of the component TIFF Tile Decoder. Performing a manipulation results in uninitialized resource. This vulnerability is identified as CVE-2026-54604. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in OpenSlide up to 4.0.0. This affects the function _openslide_tiff_read_tile of the file src/openslide-decode-tiff.c of the component TIFF Tile Decoder. The manipulation with an unknown input leads to a uninitialized resource vulnerability. CWE is classifying the issue as CWE-908. The product uses or accesses a resource that has not been initialized. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

OpenSlide is a C library for reading whole slide image files. Prior to 4.0.1, a behavior change in libtiff 4.7.1 causes the indirect TIFF tile path in src/openslide-decode-tiff.c and _openslide_tiff_read_tile() to request a full-height destination for a partial bottom tile row, allowing uninitialized heap memory to enter pixel data returned by openslide_read_region(). A crafted but valid slide can trigger the issue in TIFF-based formats other than Hamamatsu NDPI when a network service renders attacker-provided slides. Successful extraction depends on pixel transparency handling and recompression, OpenSlide with libtiff 4.7.0 or earlier is not affected, and official binary builds 4.0.0.10 and 4.0.0.11 are affected. This issue is fixed in OpenSlide 4.0.1 and official binary build 4.0.0.12.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-54604 since 06/15/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available.

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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