---
title: "CVE-2026-87823: zstd-jni - Out of Bounds Read"
description: "zstd-jni before 1.5.7-14 contains a buffer overflow caused by 32-bit signed bounds checks on direct-ByteBuffer frame-size native methods, letting attackers read out-of-bounds memory, exploit requires crafted input with negative or overflowing offsets."
url: https://panop.io/threat-heartbeat/CVE-2026-87823/
---

# CVE-2026-87823 zstd-jni - Out of Bounds Read

zstd-jni before 1.5.7-14 contains a buffer overflow caused by 32-bit signed bounds checks on direct-ByteBuffer frame-size native methods, letting attackers read out-of-bounds memory, exploit requires crafted input with negative or overflowing offsets.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.43% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-87823)

## Details

Type

Out of Bounds Read

Impact

Denial Of Service, Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Published

9 September 2026

Updated

15 October 2026

Weakness

[CWE-190](https://cwe.mitre.org/data/definitions/190.html)

## Vendor fix

Upgrade to version 1.5.7-14 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-87823](https://nvd.nist.gov/vuln/detail/CVE-2026-87823)
- [https://github.com/luben/zstd-jni/releases/tag/v1.5.7-14](https://github.com/luben/zstd-jni/releases/tag/v1.5.7-14)
- [https://github.com/luben/zstd-jni/security/advisories/GHSA-jfr6-9xqw-2g2q](https://github.com/luben/zstd-jni/security/advisories/GHSA-jfr6-9xqw-2g2q)
- [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](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)
- [https://github.com/luben/zstd-jni](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/java/com/github/luben/zstd/Zstd.java)
- [https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/native/jni\_zstd.c](https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/native/jni_zstd.c)
- [https://github.com/luben/zstd-jni/commit/46dcb2a54c8b8f2ce2cad7187a7513f509c533ac](https://github.com/luben/zstd-jni/commit/46dcb2a54c8b8f2ce2cad7187a7513f509c533ac)
- [https://github.com/luben/zstd-jni/commit/d7a1c99322d5e1fc71932e722c0b5bb2fc525d3f](https://github.com/luben/zstd-jni/commit/d7a1c99322d5e1fc71932e722c0b5bb2fc525d3f)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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