CVE-2026-54604

Name	CVE-2026-54604
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1146705

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
openslide (PTS)	bookworm	3.4.1+dfsg-6+deb12u1	vulnerable
	trixie	3.4.1+dfsg-7+deb13u1	vulnerable
	forky, sid	4.0.1+dfsg-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
openslide	source	experimental	4.0.1+dfsg-1~0exp2
openslide	source	(unstable)	4.0.1+dfsg-1			1146705

Notes

[trixie] - openslide <ignored> (Minor issue; only an exploitable issue with behaviour change of libtiff in 4.7.1)
[bookworm] - openslide <ignored> (Minor issue; only exploitable with the libtiff 4.7.1 behaviour change)
[bullseye] - openslide <ignored> (Minor issue; only exploitable with the libtiff 4.7.1 behaviour change)
https://github.com/openslide/openslide/security/advisories/GHSA-f734-jv98-5677