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CVE-2026-32777

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 2.7.5之前版本存在安全漏洞，该漏洞源于解析DTD内容时允许无限循环。

CVSS 4.0 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
libexpat project libexpat < 2.7.5 affected
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I. Basic Information for CVE-2026-32777

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
libexpat before 2.7.5 allows an infinite loop while parsing DTD content.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
libexpat 安全漏洞
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 2.7.5之前版本存在安全漏洞，该漏洞源于解析DTD内容时允许无限循环。
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 ~ 2.7.5 -

II. Public POCs for CVE-2026-32777

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III. Intelligence Information for CVE-2026-32777

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Patches & Fixes for CVE-2026-32777 (2)

Vendor Advisories for CVE-2026-32777 (1)

Other References for CVE-2026-32777 (1)

Same Patch Batch · libexpat project · 2026-03-16 · 3 CVEs total

CVE-2026-32776 4.0 MEDIUM libexpat 代码问题漏洞
CVE-2026-32778 2.9 LOW libexpat 代码问题漏洞

IV. Related Vulnerabilities

Same product: libexpat
Same vendor: libexpat project
Same weakness: CWE-835

V. Comments for CVE-2026-32777

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