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CVE-2026-7210

The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection

Published: May 11, 2026Updated: Jun 15, 2026 Sources: CVE List NVDCWE-331
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.8%
Top 48.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-331

Affected Products

pythonpythonOSS Libraries
CPythonPython Software FoundationOSS Libraries
pythonoss-projectUSOSS Libraries
python software foundationoss-projectUSOSS Librariesaka python software foundation, psf

Exploitability

Official Patch Available

References

https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4
github.com
https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566
github.com
https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27a
github.com
and 6 more references View all →

Timeline

Published
May 11, 2026
Last Updated
Jun 15, 2026

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