# CVE-2026-87823: zstd-jni-java: zstd-jni before 1.5.7-14 performs 32-bit signed bounds checks on three direct-ByteBuffer frame-size native methods, a...

CVE-2026-87823 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-87823, released September 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-87823
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0043
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | zstd-jni opensuse-leap 16.0 | 1.5.7.16-160000.1.1 | [OPENSUSE-SU-2026:21902-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21902-1.md) | Sep 21, 2026 |
| Linux | zstd-jni sles 16.0 | 1.5.7.16-160000.1.1 | [SUSE-SU-2026:23868-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23868-1.md) | Sep 21, 2026 |
| Linux | zstd-jni-java Debian 14 | 1.5.7-23+ds-1 | [DEBIAN-CVE-2026-87823](https://patchblox.com/security/data/fix/linux/debian-cve-2026-87823.md) | Sep 9, 2026 |

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Data as of 2026-11-09T19:38:12Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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