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CVE-2026-33666— Zserio: Integer Overflow in BitStreamReader on 32-bit platforms

Quick assessment

Affected
ndsev zserio
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.

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。

CVSS 7.5 · High EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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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: CVE Program / CVE List V5
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: 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
整数溢出或超界折返
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
ndsev zserio <= 2.15.0 -

II. Public POCs for CVE-2026-33666

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III. Intelligence Information for CVE-2026-33666

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Vendor Advisories for CVE-2026-33666 (1)

IV. Related Vulnerabilities

Same product: zserio
Same vendor: ndsev
Same weakness: CWE-190

V. Comments for CVE-2026-33666

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