CVE-2026-25210
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是libexpat团队的一款使用C语言编写的流式XML解析器。 libexpat 2.7.4之前版本存在输入验证错误漏洞，该漏洞源于doContent函数缺少整数溢出检查，可能导致缓冲区大小计算错误。
Possible ATT&CK Techniques 2 AI
T1203 · Exploitation for Client Execution T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| libexpat project | libexpat | < 2.7.4 |
affected |
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I. Basic Information for CVE-2026-25210
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation.
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
libexpat 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libexpat是libexpat团队的一款使用C语言编写的流式XML解析器。 libexpat 2.7.4之前版本存在输入验证错误漏洞，该漏洞源于doContent函数缺少整数溢出检查，可能导致缓冲区大小计算错误。
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 ~ 2.7.4 | - |
|
II. Public POCs for CVE-2026-25210
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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libexpat 资源管理错误漏洞
Same weakness: CWE-190
-
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V. Comments for CVE-2026-25210
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