What’s Vulnerable › Vulnerabilities

CVE-2026-87825: zstd-jni 1.3.8-4 through 1.5.7-13 Use-After-Free of Compression and Decompression Dictionaries

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-09 · updated 2026-09-14
• Weakness: CWE-416

Description

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.

Affected products

• luben zstd-jni: from 1.3.8-4 before 1.5.7-14 — fixed in 1.5.7-14

How to fix

Upgrade to a fixed version: luben zstd-jni 1.5.7-14. Check the vendor advisory for mitigations.

References

• https://github.com/luben/zstd-jni
• https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/BaseZstdBufferDecompressingStreamNoFinalizer.java
• https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/ZstdInputStreamNoFinalizer.java
• https://github.com/luben/zstd-jni/commit/0827ed02551bbd8d6f8e4bbff99d83bf50f91938
• https://github.com/luben/zstd-jni/commit/393d7311766abbc285b149302c0fe1f94b16d555
• https://github.com/luben/zstd-jni/commit/a560131d7834598afd9cea6b7c107bc88e915936
• https://github.com/luben/zstd-jni/releases/tag/v1.5.7-14
• https://github.com/luben/zstd-jni/security/advisories/GHSA-947w-pxjj-c7m9
• https://www.vulncheck.com/advisories/zstd-jni-1.3.8-4-through-1.5.7-13-use-after-free-of-compression-and-decompression-dictionaries
• https://github.com/luben/zstd-jni/security/advisories/GHSA-947w-pxjj-c7m9

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