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CVE-2026-86139

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.

Xmlsoft libxml2是Xmlsoft公司开源的一款支持XML文档解析与处理的软件库。 Xmlsoft libxml2 2.15.4之前版本存在数字错误漏洞，该漏洞源于uri.c中的xmlURIEscapeStr存在整数溢出。

CVSS 6.9 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
xmlsoft libxml2 < 2.15.4 affected
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I. Basic Information for CVE-2026-86139

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer 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
Vulnerability Title
Xmlsoft libxml2 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xmlsoft libxml2是Xmlsoft公司开源的一款支持XML文档解析与处理的软件库。 Xmlsoft libxml2 2.15.4之前版本存在数字错误漏洞，该漏洞源于uri.c中的xmlURIEscapeStr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

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

II. Public POCs for CVE-2026-86139

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III. Intelligence Information for CVE-2026-86139

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Patches & Fixes for CVE-2026-86139 (2)

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

CVE-2026-86140 8.0 HIGH Xmlsoft libxml2 缓冲区错误漏洞
CVE-2026-86138 6.9 MEDIUM Xmlsoft libxml2 数字错误漏洞
CVE-2026-86143 6.9 MEDIUM Xmlsoft libxml2 数字错误漏洞
CVE-2026-86142 6.9 MEDIUM Xmlsoft libxml2 缓冲区错误漏洞
CVE-2026-86144 5.6 MEDIUM Xmlsoft libxml2 权限许可和访问控制问题漏洞
CVE-2026-86141 2.9 LOW Xmlsoft libxml2 异常处理不当漏洞
CVE-2026-86137 2.9 LOW Xmlsoft libxml2 缓冲区错误漏洞

IV. Related Vulnerabilities

Same product: libxml2
Same vendor: xmlsoft
Same weakness: CWE-190