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CVE-2026-45186

Quick assessment

Affected
libexpat project libexpat
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.

libexpat是libexpat团队的一款使用C语言编写的流式XML解析器。 libexpat 2.8.1之前版本存在安全漏洞，该漏洞源于属性名冲突检查的计算复杂度问题，可能导致通过特制XML输入实现拒绝服务。

CVSS 2.9 · Low EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
libexpat project libexpat < 2.8.1 affected
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I. Basic Information for CVE-2026-45186

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
libexpat 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libexpat是libexpat团队的一款使用C语言编写的流式XML解析器。 libexpat 2.8.1之前版本存在安全漏洞，该漏洞源于属性名冲突检查的计算复杂度问题，可能导致通过特制XML输入实现拒绝服务。
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
libexpat project libexpat 0 ~ 2.8.1 -

II. Public POCs for CVE-2026-45186

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III. Intelligence Information for CVE-2026-45186

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Patches & Fixes for CVE-2026-45186 (1)

IV. Related Vulnerabilities

Same product: libexpat
Same vendor: libexpat project
Same weakness: CWE-407

V. Comments for CVE-2026-45186

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