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CVE-2026-33524— Zserio: Integer Overflow in BitStreamReader and Unbounded Memory Allocation in Deserialization

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之前版本存在安全漏洞，该漏洞源于特制有效载荷可强制分配高达16 GB的内存，导致进程因OOM错误崩溃。

CVSS 7.5 · High EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-33524

Vulnerability Information
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Vulnerability Title
Zserio: Integer Overflow in BitStreamReader and Unbounded Memory Allocation in Deserialization
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, a crafted payload as small as 4-5 bytes can force memory allocations of up to 16 GB, crashing any process with an OOM error (Denial of Service). 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
未经控制的内存分配
Source: CVE Program / CVE List V5
Vulnerability Title
zserio 安全漏洞
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之前版本存在安全漏洞，该漏洞源于特制有效载荷可强制分配高达16 GB的内存，导致进程因OOM错误崩溃。
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 < 2.18.1 -

II. Public POCs for CVE-2026-33524

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III. Intelligence Information for CVE-2026-33524

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Vendor Advisories for CVE-2026-33524 (1)

IV. Related Vulnerabilities

Same product: zserio
Same vendor: ndsev
Same weakness: CWE-789

V. Comments for CVE-2026-33524

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