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CVE-2026-56412

CVSS 4.9 · Medium EPSS 0.14% · P4

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-2026-56412

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
libexpat project libexpat 资源管理错误漏洞
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之前版本存在资源管理错误漏洞，该漏洞源于未在doCdataSection中考虑XML_TOK_DATA_CHARS，导致缺乏处理程序调用深度跟踪，从而可能发生释放后重用。
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-2026-56412

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III. Intelligence Information for CVE-2026-56412

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Patches & Fixes for CVE-2026-56412 (1)

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

CVE-2026-564056.9 MEDIUMlibexpat project libexpat 数字错误漏洞
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

IV. Related Vulnerabilities

Same product: libexpat
Same vendor: libexpat project
Same weakness: CWE-416

V. Comments for CVE-2026-56412

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