CVE-2026-7210

`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 4.0

6.3CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.7% chance of exploitation in the next 30 days; higher than 51% of CVEs (scores of 2026-10-25)

CWE

CWE-331

Published

2026-05-11

Modified

2026-10-02

Record from

the NVD, synced 2026-10-19

Affected

• python:python

References

• https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4
• https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566
• https://github.com/python/cpython/commit/cbaecf9f16da611a646d507c1cbca265c588fc56
• https://github.com/python/cpython/commit/e37df2a6a71d6538698e2d3188a7c345b827640b
• https://github.com/python/cpython/commit/ea70712d1a8508e14e9677d44f838dab04dc0286

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