Use After Free Affecting com.github.luben:zstd-jni package, versions [1.3.8-4,1.5.7-14)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-COMGITHUBLUBEN-19659617
- published10 Sept 2026
- disclosed9 Sept 2026
- creditYu Bao
Introduced: 9 Sep 2026
NewCVE-2026-87877 (opens in a new tab)How to fix?
Upgrade com.github.luben:zstd-jni to version 1.5.7-14 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free in the setDict, setLongMax, setLevel, and setRefMultipleDDicts methods of its streaming classes. An attacker can corrupt native heap state or crash the JVM by calling these setters on a stream after close(), causing them to write through a freed native context handle. The vulnerable code lives in BaseZstdBufferDecompressingStreamNoFinalizer, ZstdInputStreamNoFinalizer, and ZstdOutputStreamNoFinalizer, where these post-close setters still pass the stale native pointer into zstd's dictionary and parameter-loading routines. In applications that reuse or retain stream objects across lifecycle boundaries, the resulting write can alter an unrelated live native object or trigger a JVM crash.