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CVE-2026-7210— The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection

Quick assessment

Affected
Python Software Foundation CPython
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.

CPython是Python基金会的一个用C语言实现的Python解释器。 CPython存在安全特征问题漏洞，该漏洞源于Expat哈希洪水保护使用不足的熵，可能导致特制XML文档触发哈希洪水。

CVSS 6.3 · Medium EPSS 1.35% · P71

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
Python Software Foundation CPython < 3.10.22 affected
3.11.0< 3.11.16 affected
3.12.0< 3.12.14 affected
3.13.0< 3.13.14 affected
3.14.0< 3.14.6 affected
3.15.0a1< 3.15.0b2 affected
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I. Basic Information for CVE-2026-7210

Vulnerability Information
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Vulnerability Title
The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection
Source: CVE Program / CVE List V5
Vulnerability Description
`xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息熵不充分
Source: CVE Program / CVE List V5
Vulnerability Title
CPython 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CPython是Python基金会的一个用C语言实现的Python解释器。 CPython存在安全特征问题漏洞，该漏洞源于Expat哈希洪水保护使用不足的熵，可能导致特制XML文档触发哈希洪水。
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
Python Software Foundation CPython 0 ~ 3.10.22 -

II. Public POCs for CVE-2026-7210

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III. Intelligence Information for CVE-2026-7210

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Patches & Fixes for CVE-2026-7210 (8)

Vendor Advisories for CVE-2026-7210 (1)

Mailing List Discussions for CVE-2026-7210 (1)

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation
Same weakness: CWE-331

V. Comments for CVE-2026-7210

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