CVE-2026-33666— Zserio: Integer Overflow in BitStreamReader on 32-bit platforms
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I. Basic Information for CVE-2026-33666
Vulnerability Information
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Vulnerability Title
Zserio: Integer Overflow in BitStreamReader on 32-bit platforms
Source: NVD (National Vulnerability Database)
Vulnerability Description
Zserio is a framework for serializing structured data with a compact and efficient way with low overhead. Prior to 2.18.1, in BitStreamReader.h readBytes() / readString(), the setBitPosition() bounds check receives the overflowed value and is completely bypassed. The code then reads len bytes (512 MB) from a buffer that is only a few bytes long, causing a segmentation fault. This vulnerability is fixed in 2.18.1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数溢出或超界折返
Source: NVD (National Vulnerability Database)
Vulnerability Title
zserio 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zserio是Navigation Data Standard e.V.开源的一个高效序列化结构化数据的框架。 zserio 2.18.1之前版本存在输入验证错误漏洞，该漏洞源于BitStreamReader.h中readBytes()/readString()函数的setBitPosition()边界检查被溢出值绕过，导致从仅几字节的缓冲区读取512 MB数据，引发分段错误。
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
II. Public POCs for CVE-2026-33666
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IV. Related Vulnerabilities
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