CVE-2026-87877: Luben Zstd-Jni

High severity, CVSS 7.7. EPSS: 0.2% chance of exploitation in the next 30 days.

zstd-jni versions before 1.5.7-14 fail to validate closed state in setDict, setLongMax, setLevel and setRefMultipleDDicts methods of stream classes. Attackers can call these methods on closed streams to write through freed native pointers, corrupting unrelated objects or crashing the JVM.

Affected products

• Luben Zstd-Jni: from 1.3.8-4, before 1.5.7-14 (fixed in 1.5.7-14)

Published 2026-09-09. Last modified 2026-09-09.