CVE-2026-87877

A flaw was found in zstd-jni. An attacker could exploit a use-after-free vulnerability by calling specific methods on closed streams without proper validation. This could lead to memory corruption, potentially allowing the attacker to corrupt unrelated objects or cause the Java Virtual Machine (JVM) to crash, resulting in a denial of service.

Red Hat has determined that CVE-2026-87877 affects Red Hat products that include the zstd-jni library in a vulnerable version. The vulnerability can allow memory corruption or denial of service when specific stream methods are called after the stream has been closed.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

No complete workaround is currently available. As a temporary measure, applications using zstd-jni should not call setDict(), setLongMax(), setLevel(), or setRefMultipleDDicts() on a stream after close(). Upgrade to a Red Hat product release containing zstd-jni 1.5.7-14 or later when available.