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CVE-2023-43642— Missing upper bound check on chunk length in snappy-java

Quick assessment

Affected
xerial snappy-java
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Snappy是KNP Labs个人开发者的一个 PHP 库，允许从 url 或 html 页面生成缩略图、快照或 PDF。 Snappy 1.1.10.3及之前版本存在安全漏洞，该漏洞源于SnappyInputStream缺少对块长度的上限检查，导致解压过大的数据时容易受到拒绝服务（DoS）攻击。

CVSS 7.5 · High EPSS 1.21% · P68

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2023-43642

Vulnerability Information
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Vulnerability Title
Missing upper bound check on chunk length in snappy-java
Source: CVE Program / CVE List V5
Vulnerability Description
snappy-java is a Java port of the snappy, a fast C++ compresser/decompresser developed by Google. The SnappyInputStream was found to be vulnerable to Denial of Service (DoS) attacks when decompressing data with a too large chunk size. Due to missing upper bound check on chunk length, an unrecoverable fatal error can occur. All versions of snappy-java including the latest released version 1.1.10.3 are vulnerable to this issue. A fix has been introduced in commit `9f8c3cf74` which will be included in the 1.1.10.4 release. Users are advised to upgrade. Users unable to upgrade should only accept compressed data from trusted sources.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Snappy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Snappy是KNP Labs个人开发者的一个 PHP 库，允许从 url 或 html 页面生成缩略图、快照或 PDF。 Snappy 1.1.10.3及之前版本存在安全漏洞，该漏洞源于SnappyInputStream缺少对块长度的上限检查，导致解压过大的数据时容易受到拒绝服务（DoS）攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
xerial snappy-java < 1.1.10.4 -

II. Public POCs for CVE-2023-43642

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10872 chars
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III. Intelligence Information for CVE-2023-43642

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Patches & Fixes for CVE-2023-43642 (1)

Vendor Advisories for CVE-2023-43642 (1)

IV. Related Vulnerabilities

Same product: snappy-java
Same vendor: xerial
Same weakness: CWE-770

V. Comments for CVE-2023-43642

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