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CVE-2026-56403

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 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，该漏洞源于整数溢出（Integer Overflow）问题，可能导致本地攻击者利用storeAtts函数触发漏洞，造成机密性和完整性被破坏。

CVSS 6.9 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
libexpat project libexpat < 2.8.2 affected
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I. Basic Information for CVE-2026-56403

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 storeAtts.
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，该漏洞源于整数溢出（Integer Overflow）问题，可能导致本地攻击者利用storeAtts函数触发漏洞，造成机密性和完整性被破坏。
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 ~ 2.8.2 -

II. Public POCs for CVE-2026-56403

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III. Intelligence Information for CVE-2026-56403

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Patches & Fixes for CVE-2026-56403 (1)

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

CVE-2026-56405 6.9 MEDIUM libexpat project libexpat 数字错误漏洞
CVE-2026-56404 6.9 MEDIUM libexpat project libexpat 数字错误漏洞
CVE-2026-56407 6.9 MEDIUM libexpat project libexpat 数字错误漏洞
CVE-2026-56411 6.9 MEDIUM libexpat project libexpat 数字错误漏洞
CVE-2026-56410 6.9 MEDIUM libexpat project libexpat 数字错误漏洞
CVE-2026-56408 6.9 MEDIUM libexpat project libexpat 数字错误漏洞
CVE-2026-56406 6.9 MEDIUM libexpat project libexpat 数字错误漏洞
CVE-2026-56409 6.5 MEDIUM libexpat project libexpat 数字错误漏洞
CVE-2026-56412 4.9 MEDIUM libexpat 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-2026-56403

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