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Vulnerability record · CVE-2026-87877 · published 9 September 2026

CVE-2026-87877: Use after free vulnerability

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.

7.0 CVSS 4.0 High EPSS 0.20% · top 91.0% CWE-416 · Use after free Awaiting Analysis
7.0CVSS 4.0 base score
0.20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
10References
9 Sep 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/luben/zstd-jni
https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/BaseZstdBufferDecompressingStreamNo
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/f38f9a1563113d96d0fc38baee543f7457dd8a8e
https://github.com/luben/zstd-jni/releases/tag/v1.5.7-14
https://github.com/luben/zstd-jni/security/advisories/GHSA-2jw3-mg7f-vw4q
https://www.vulncheck.com/advisories/zstd-jni-1.3.8-4-through-1.5.7-13-use-after-free-via-setters-called-after-close
https://github.com/luben/zstd-jni/security/advisories/GHSA-2jw3-mg7f-vw4q

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-87877), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.