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CVE-2026-86138

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 之前版本中， 文件中的 函数存在整数溢出问题，进而导致基于堆的缓冲区溢出。

CVSS 6.9 · Medium

Possible ATT&CK Techniques 1 AI

T1195 · Supply Chain Compromise
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I. Basic Information for CVE-2026-86138

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.
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

Affected Products

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

II. Public POCs for CVE-2026-86138

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III. Intelligence Information for CVE-2026-86138

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Other References for CVE-2026-86138 (2)

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

CVE-2026-86140 8.0 HIGH libxml2<2.15.4 valid.c strcat栈溢出
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-2026-86144 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-190

V. Comments for CVE-2026-86138

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