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Vulnerability record · CVE-2026-87824 · published 9 September 2026

CVE-2026-87824: Out-of-bounds read vulnerability

zstd-jni before 1.5.7-14 fails to validate the samples buffer capacity in Zstd.trainFromBufferDirect, allowing attackers to read past buffer boundaries by supplying oversized per-sample lengths. Attackers can trigger out-of-bounds memory access by providing crafted sample length arrays that cause the native implementation to walk past the buffer allocation, resulting in JVM termination.

8.7 CVSS 4.0 High EPSS 0.39% · top 69.7% CWE-125 · Out-of-bounds read Awaiting Analysis
8.7CVSS 4.0 base score
0.39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
8References
20 Sep 2026Last modified by NVD

Description

zstd-jni before 1.5.7-14 fails to validate the samples buffer capacity in Zstd.trainFromBufferDirect, allowing attackers to read past buffer boundaries by supplying oversized per-sample lengths. Attackers can trigger out-of-bounds memory access by providing crafted sample length arrays that cause the native implementation to walk past the buffer allocation, resulting in JVM termination.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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/Zstd.java
https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/native/jni_zdict.c
https://github.com/luben/zstd-jni/commit/53d3c6342883f7d6717b2477a7f9c1b4a4a56980
https://github.com/luben/zstd-jni/commit/bba6cfca2c0897f1fa004f4193247479f10da853
https://github.com/luben/zstd-jni/releases/tag/v1.5.7-14
https://github.com/luben/zstd-jni/security/advisories/GHSA-257p-3h6w-pg7h
https://www.vulncheck.com/advisories/zstd-jni-1.3.3-1-through-1.5.7-13-out-of-bounds-read-via-zstd-trainfrombufferdirect

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Source: NIST National Vulnerability Database (record CVE-2026-87824), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.