What’s Vulnerable › Vulnerabilities

CVE-2026-87795: zstd-jni 1.2.0 through 1.5.7-13 Out-of-Bounds Read via ZstdDictCompress

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% 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-125

Description

zstd-jni versions before 1.5.7-14 fail to validate offset and length parameters in the ZstdDictCompress constructor, allowing out-of-bounds memory reads. Attackers can supply untrusted offset or length values to read native heap memory into the compression dictionary, typically causing JVM crashes.

Affected products

• luben zstd-jni: from 1.2.0 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/ZstdDictCompress.java
• https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/native/jni_fast_zstd.c
• https://github.com/luben/zstd-jni/commit/0d64de4dee6606ff506be36c7f2e714ad0c80fdb
• https://github.com/luben/zstd-jni/commit/1c4e5a6c3ce8458095225d987d669e6a0937734a
• https://github.com/luben/zstd-jni/releases/tag/v1.5.7-14
• https://github.com/luben/zstd-jni/security/advisories/GHSA-ff36-7w3w-g8rm
• https://www.vulncheck.com/advisories/zstd-jni-1.2.0-through-1.5.7-13-out-of-bounds-read-via-zstddictcompress
• https://github.com/luben/zstd-jni/security/advisories/GHSA-ff36-7w3w-g8rm

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