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CVE-2026-72522

Quick assessment

Affected
libexpat project libexpat
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.

Expat是Expat组织的一个XML解析组件库。 Expat 2.8.3之前版本存在缓冲区错误漏洞，该漏洞源于在*_toUtf16函数的Unicode处理过程中将低代理项与高代理项同等对待，可能导致越界读取和无限循环。

CVSS 6.2 · Medium EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
libexpat project libexpat < 2.8.3 affected
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I. Basic Information for CVE-2026-72522

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Expat 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Expat是Expat组织的一个XML解析组件库。 Expat 2.8.3之前版本存在缓冲区错误漏洞，该漏洞源于在*_toUtf16函数的Unicode处理过程中将低代理项与高代理项同等对待，可能导致越界读取和无限循环。
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
libexpat project libexpat 0 ~ 2.8.3 -

II. Public POCs for CVE-2026-72522

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-72522

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Patches & Fixes for CVE-2026-72522 (1)

IV. Related Vulnerabilities

Same product: libexpat
Same vendor: libexpat project
Same weakness: CWE-125

V. Comments for CVE-2026-72522

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