CVE-2026-54604 OpenSlide: openslide_read_region() returns uninitialized memory with libtiff 4.7.1
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-54604?
CVE-2026-54604 is a medium-severity vulnerability in openslide, published on 17 Sep 2026.
Official description
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.
Which versions are affected by CVE-2026-54604?
How do I fix CVE-2026-54604?
Upgrade to a fixed version.
Is CVE-2026-54604 being exploited?
There is no known exploitation of CVE-2026-54604 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-54604, GHSA-f734-jv98-5677, UBUNTU-CVE-2026-54604.