CVE-2026-86142
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，由于 xmlXPtrEval 中 xpointer 长度饱和（length saturation），导致 xmlXPtrEvalXPtrPart 函数存在基于堆的缓冲区溢出漏洞。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-86142
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In libxml2 before 2.15.4, there is a heap-based buffer overflow in xmlXPtrEvalXPtrPart because of xmlXPtrEval xpointer length saturation.
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
堆缓冲区溢出
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-86142
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-86142 (3)
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-2026-86139 | 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-2026-86143 | 6.9 MEDIUM | libxml2 2.15.4 前 xmlIO 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 |
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Same weakness: CWE-122
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V. Comments for CVE-2026-86142
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