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CVE-2026-87825— zstd-jni 1.3.8-4 through 1.5.7-13 Use-After-Free of Compression and Decompression Dictionaries

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 1.5.7-14 之前的版本中存在一个释放后使用（use-after-free）漏洞。该漏洞表现为：流（streams）和上下文（contexts）仅在调用“load”期间持有字典（dictionary）的共享锁，导致字典在仍被引用时可能被提前关闭。攻击者可以在将字典与某个流或上下文关联后将其关闭，使得后续的读取或写入操作访问已被释放的原生内存，从而导致静默的数据损坏或 JVM 崩溃。

CVSS 7.7 · High
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I. Basic Information for CVE-2026-87825

Vulnerability Information
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Vulnerability Title
zstd-jni 1.3.8-4 through 1.5.7-13 Use-After-Free of Compression and Decompression Dictionaries
Source: CVE Program / CVE List V5
Vulnerability Description
zstd-jni before 1.5.7-14 contains a use-after-free vulnerability where streams and contexts hold a dictionary's shared lock only during the load call, allowing the dictionary to be closed while still referenced. Attackers can close a dictionary after associating it with a stream or context, causing subsequent read or write operations to access freed native memory, resulting in silent data corruption or JVM crashes.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
luben zstd-jni 1.3.8-4 ~ 1.5.7-14 -

II. Public POCs for CVE-2026-87825

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III. Intelligence Information for CVE-2026-87825

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Patches & Fixes for CVE-2026-87825 (5)

Vendor Advisories for CVE-2026-87825 (2)

Proof of Concept for CVE-2026-87825 (1)

Vendor Pages for CVE-2026-87825 (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-2026-87823 8.2 HIGH zstd-jni 1.1.1 through 1.5.7-13 Out-of-Bounds Read via Direct ByteBuffer Frame-Size Method
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-2026-87824 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-416

V. Comments for CVE-2026-87825

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