CVE-2026-7210

Name: CVE-2026-7210
Creator: NVD / NIST
Published: 2026-05-11T18:16:42.413+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.3/10EPSS 0.79%

Last modified Jun 17, 2026

CVE-2026-7210 is a medium-severity vulnerability rated 6.3/10 on the CVSS scale. `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.. EPSS estimates a 0.79% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

CVSS 4.0

6.3/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.79%

51.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-331

Affected Software

Vendor	Product	Versions
Python	Python	< 3.15.0

References

https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4Patch
https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566Patch
https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27aPatch
https://github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145fPatch
https://github.com/python/cpython/issues/149018Issue Tracking
https://github.com/python/cpython/pull/149023Issue Tracking, Patch
https://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/05/11/13Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/05/11/8Mailing List, Third Party Advisory

Timeline

Published: May 11, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-7210?

How severe is CVE-2026-7210?

CVE-2026-7210 has a CVSS score of 6.3/10 (MEDIUM severity). The EPSS model estimates a 0.79% probability of exploitation in the next 30 days.

How do I fix CVE-2026-7210?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-7210?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST