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CVE-2026-56405

CVSS 6.9 · Medium EPSS 0.12% · P3

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
libexpat projectlibexpat< 2.8.2affected
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I. Basic Information for CVE-2026-56405

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
libexpat before 2.8.2 has an integer overflow in getAttributeId.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
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
libexpat project libexpat 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libexpat project libexpat是libexpat project组织开源的一款C语言编写的流式XML解析器。 libexpat project libexpat 2.8.2之前版本存在数字错误漏洞，该漏洞源于getAttributeId中存在整数溢出。
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

VendorProductAffected VersionsCPESubscribe
libexpat projectlibexpat 0 ~ 2.8.2 -

II. Public POCs for CVE-2026-56405

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III. Intelligence Information for CVE-2026-56405

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Patches & Fixes for CVE-2026-56405 (1)

Same Patch Batch · libexpat project · 2026-06-21 · 10 CVEs total

CVE-2026-564046.9 MEDIUMlibexpat project libexpat 数字错误漏洞
CVE-2026-564076.9 MEDIUMlibexpat project libexpat 数字错误漏洞
CVE-2026-564036.9 MEDIUMlibexpat project libexpat 数字错误漏洞
CVE-2026-564116.9 MEDIUMlibexpat project libexpat 数字错误漏洞
CVE-2026-564106.9 MEDIUMlibexpat project libexpat 数字错误漏洞
CVE-2026-564086.9 MEDIUMlibexpat project libexpat 数字错误漏洞
CVE-2026-564066.9 MEDIUMlibexpat project libexpat 数字错误漏洞
CVE-2026-564096.5 MEDIUMlibexpat project libexpat 数字错误漏洞
CVE-2026-564124.9 MEDIUMlibexpat project libexpat 资源管理错误漏洞

IV. Related Vulnerabilities

Same product: libexpat
Same vendor: libexpat project
Same weakness: CWE-190

V. Comments for CVE-2026-56405

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