# CVE-2026-87823

## Summary

- **CVE ID:** CVE-2026-87823
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-190
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 9, 2026

## Description

zstd-jni before 1.5.7-14 performs 32-bit signed bounds checks on three direct-ByteBuffer frame-size native methods, allowing out-of-bounds memory reads via negative or overflowing offsets. Attackers can supply negative offset values near Integer.MIN_VALUE to read unmapped memory, causing JVM termination or extracting arbitrary frame size data from unintended memory locations.

## Affected Products

- luben — zstd-jni (1.1.1)

## References

- [CNA](https://github.com/luben/zstd-jni/security/advisories/GHSA-jfr6-9xqw-2g2q)
- [CNA](https://github.com/luben/zstd-jni/commit/d7a1c99322d5e1fc71932e722c0b5bb2fc525d3f)
- [CNA](https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/native/jni_zstd.c)
- [CNA](https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/Zstd.java)
- [CNA](https://github.com/luben/zstd-jni/releases/tag/v1.5.7-14)
- [CNA](https://github.com/luben/zstd-jni/commit/46dcb2a54c8b8f2ce2cad7187a7513f509c533ac)
- [CNA](https://github.com/luben/zstd-jni)
- [CNA](https://www.vulncheck.com/advisories/zstd-jni-1.1.1-through-1.5.7-13-out-of-bounds-read-via-direct-bytebuffer-frame-size-methods)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.43%
- **EPSS Percentile:** 36.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._