# CVE-2026-87877: zstd-jni-java: zstd-jni versions before 1.5.7-14 fail to validate closed state in setDict, setLongMax, setLevel and setRefMultipleDD...

CVE-2026-87877 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-87877, released September 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-87877
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 9, 2026

## 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.

## 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-2026-87877](https://patchblox.com/security/data/fix/linux/debian-cve-2026-87877.md) | Sep 9, 2026 |

---

Data as of 2026-11-09T13:31:49Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.