Bug 2538410 (CVE-2026-54604)

Summary: CVE-2026-54604 openslide: Information disclosure via crafted TIFF image processing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in OpenSlide, a C library for reading whole slide image files. A remote attacker can provide a specially crafted image file to a network service that uses OpenSlide. This can cause uninitialized heap memory to be included in the pixel data returned by the openslide_read_region() function, potentially leading to information disclosure.
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Bug Depends On: 2565655, 2565656    
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Description OSIDB Bzimport 2026-09-22 18:29:26 UTC 
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.