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CVE-2026-86143

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， 模块存在一个安全漏洞： 与 之间的一致性缺陷，导致负数长度值传递到了 回调函数中。该漏洞的实质是在调用 前缺少对整数溢出的检查。由于该长度值在回调函数内部被广泛使用，因此具有广泛的安全影响。

CVSS 6.9 · Medium

Possible ATT&CK Techniques 1 AI

T1061
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I. Basic Information for CVE-2026-86143

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.
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
整数强制转换错误
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-2026-86143

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III. Intelligence Information for CVE-2026-86143

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Other References for CVE-2026-86143 (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-2026-86142 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-192

V. Comments for CVE-2026-86143

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