CVE-2026-7210

9.8 CRITICAL
Published: May 11, 2026 Modified: June 10, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4
Source: cna@python.org
https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566
Source: cna@python.org
https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27a
Source: cna@python.org
https://github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145f
Source: cna@python.org
https://github.com/python/cpython/issues/149018
Source: cna@python.org
Issue Tracking
https://github.com/python/cpython/pull/149023
Source: cna@python.org
Issue Tracking Patch
https://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/
Source: cna@python.org
Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/05/11/13
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/05/11/8
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List Third Party Advisory

9 reference(s) from NVD

Quick Stats

CVSS v3 Score
9.8 / 10.0
EPSS (Exploit Probability)
0.2%
41th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

CWE-331

Affected Vendors

python

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