CVE-2026-87825 PUBLISHED

zstd-jni before 1.5.7-14 contains a use-after-free vulnerability where streams and contexts hold a dictionary's shared lock only during the load call, allowing the dictionary to be closed while still referenced. Attackers can close a dictionary after associating it with a stream or context, causing subsequent read or write operations to access freed native memory, resulting in silent data corruption or JVM crashes.

• Yu Bao, PayPal Cyber Security Team finder

• GitHub Security Advisory (GHSA-947w-pxjj-c7m9)
• Fix commit: hold the dictionary shared lock for the stream's usage window
• Fix commit: cross-object lifetime tracking for dictionaries and contexts
• Shared lock released as soon as the dictionary is loaded at v1.5.7-13
• Same lock lifecycle in the buffer stream base class at v1.5.7-13
• zstd-jni v1.5.7-14 Release Notes
• Commit that made setDict load the dictionary eagerly into the native context (first released in 1.3.8-4)
• https://github.com/luben/zstd-jni
• VulnCheck Advisory: zstd-jni 1.3.8-4 through 1.5.7-13 Use-After-Free of Compression and Decompression Dictionaries

• Use After Free CWE