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CVE-2026-87823— zstd-jni 1.1.1 through 1.5.7-13 Out-of-Bounds Read via Direct ByteBuffer Frame-Size Methods

Quick assessment

Affected
luben zstd-jni
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

zstd-jni 在 1.5.7-14 版本之前，针对三个直接 ByteBuffer 帧大小原生方法执行 32 位有符号边界检查，允许通过负数或溢出的偏移量进行越界内存读取。攻击者可以提供接近 的负偏移值，从而读取未映射的内存，导致 JVM 终止或从非预期内存位置提取任意帧大小数据。

CVSS 8.2 · High
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I. Basic Information for CVE-2026-87823

Vulnerability Information
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Vulnerability Title
zstd-jni 1.1.1 through 1.5.7-13 Out-of-Bounds Read via Direct ByteBuffer Frame-Size Methods
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
luben zstd-jni 1.1.1 ~ 1.5.7-14 -

II. Public POCs for CVE-2026-87823

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-87823

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Patches & Fixes for CVE-2026-87823 (1)

Vendor Advisories for CVE-2026-87823 (2)

Proof of Concept for CVE-2026-87823 (2)

Vendor Pages for CVE-2026-87823 (1)

Same Patch Batch · luben · 2026-09-09 · 5 CVEs total

CVE-2026-87795 8.2 HIGH zstd-jni 1.2.0 through 1.5.7-13 Out-of-Bounds Read via ZstdDictCompress
CVE-2026-87877 7.7 HIGH zstd-jni 1.3.8-4 through 1.5.7-13 Use-After-Free via Setters Called After close()
CVE-2026-87825 7.7 HIGH zstd-jni 1.3.8-4 through 1.5.7-13 Use-After-Free of Compression and Decompression Dictiona
CVE-2026-87824 7.5 HIGH zstd-jni 1.3.3-1 through 1.5.7-13 Out-of-Bounds Read via Zstd.trainFromBufferDirect

IV. Related Vulnerabilities

Same product: zstd-jni
Same vendor: luben
Same weakness: CWE-190

V. Comments for CVE-2026-87823

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