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CVE-2026-56132

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.

libexpat project libexpat是libexpat project组织开源的一款C语言编写的流式XML解析器。 libexpat project libexpat 2.8.2之前版本存在竞争条件问题漏洞，该漏洞源于xmlparse.c文件中doProlog函数对scaffold后备数组重新分配处理不当，且存在解析器间数据结构共享问题，可能导致堆缓冲区溢出。

CVSS 6.9 · Medium EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
libexpat project libexpat < 2.8.2 affected
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I. Basic Information for CVE-2026-56132

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.
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
不正确的同步机制
Source: CVE Program / CVE List V5
Vulnerability Title
libexpat project libexpat 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libexpat project libexpat是libexpat project组织开源的一款C语言编写的流式XML解析器。 libexpat project libexpat 2.8.2之前版本存在竞争条件问题漏洞，该漏洞源于xmlparse.c文件中doProlog函数对scaffold后备数组重新分配处理不当，且存在解析器间数据结构共享问题，可能导致堆缓冲区溢出。
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
libexpat project libexpat 0 ~ 2.8.2 -

II. Public POCs for CVE-2026-56132

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III. Intelligence Information for CVE-2026-56132

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Patches & Fixes for CVE-2026-56132 (1)

IV. Related Vulnerabilities

Same product: libexpat
Same vendor: libexpat project
Same weakness: CWE-821

V. Comments for CVE-2026-56132

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