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CVE-2026-86140

Quick assessment

Affected
xmlsoft libxml2
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.

在 libxml2 2.15.4 之前的版本中，valid.c 文件中的 xmlSnprintfElements 函数存在基于堆/栈的 strcat 缓冲区溢出漏洞。

CVSS 8.0 · High

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-86140

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
xmlsoft libxml2 0 ~ 2.15.4 -

II. Public POCs for CVE-2026-86140

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III. Intelligence Information for CVE-2026-86140

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Other References for CVE-2026-86140 (2)

Same Patch Batch · xmlsoft · 2026-09-05 · 8 CVEs total

CVE-2026-86143 6.9 MEDIUM libxml2 2.15.4 前 xmlIO 整数溢出
CVE-2026-86142 6.9 MEDIUM libxml2 2.15.4前 xpointer堆溢出
CVE-2026-86139 6.9 MEDIUM libxml2 2.15.4 前 xmlURIEscapeStr 整数溢出
CVE-2026-86138 6.9 MEDIUM libxml2<2.15.4整数溢出致堆缓冲区溢出
CVE-2026-86144 5.6 MEDIUM libxml2 2.15.4前XInclude未传播解析标志致SSRF漏洞
CVE-2026-86141 2.9 LOW libxml2<2.15.4 NULL指针解引用
CVE-2026-86137 2.9 LOW libxml2 <2.15.4 越界读取漏洞

IV. Related Vulnerabilities

Same product: libxml2
Same vendor: xmlsoft
Same weakness: CWE-121

V. Comments for CVE-2026-86140

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