CVE-2026-87823

Name	CVE-2026-87823
Description	zstd-jni before 1.5.7-14 performs 32-bit signed bounds checks on three direct-ByteBuffer frame-size native methods, allowing out-of-bounds memory reads via negative or overflowing offsets. Attackers can supply negative offset values near Integer.MIN_VALUE to read unmapped memory, causing JVM termination or extracting arbitrary frame size data from unintended memory locations.
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)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
zstd-jni-java (PTS)	bookworm	1.5.2-5+ds-3	vulnerable
	trixie	1.5.2-5+ds-7	vulnerable
	forky, sid	1.5.2-5+ds-8	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
zstd-jni-java	source	(unstable)	(unfixed)

Notes

https://github.com/luben/zstd-jni/security/advisories/GHSA-jfr6-9xqw-2g2q
Fixed by: https://github.com/luben/zstd-jni/commit/d7a1c99322d5e1fc71932e722c0b5bb2fc525d3f (v1.5.7-14)