---
id: CVE-2026-7210
title: >-
  `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 …
summary: >-
  `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 …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-331
vendor: python
product: python
affected:
  - python < 3.13.14
  - 'python >= 3.14.0, < 3.14.6'
  - python = 3.15.0
patched:
  - python 3.14.6
published: '2026-05-11'
updated: '2026-07-27'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-7210'
references:
  - url: >-
      https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27a
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145f
    label: cna@python.org
  - url: 'https://github.com/python/cpython/issues/149018'
    label: cna@python.org
  - url: 'https://github.com/python/cpython/pull/149023'
    label: cna@python.org
  - url: >-
      https://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/
    label: cna@python.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/05/11/13'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.openwall.com/lists/oss-security/2026/05/11/8'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7210.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-7210'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2469216'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-7210'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-7210'
  - url: 'https://access.redhat.com/errata/RHSA-2026:67572'
  - url: 'https://access.redhat.com/errata/RHSA-2026:69069'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68135'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68154'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68309'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00672
epssPercentile: 0.50644
ingestedAt: '2026-07-27T18:22:58.198Z'
scores:
  nvd: 7.5
  vendor: 5.3
---

## Overview

`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.

## Affected

- `python < 3.13.14`
- `python >= 3.14.0, < 3.14.6`
- `python = 3.15.0`

## Remediation

Upgrade past the affected range:

- `python 3.14.6`

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Exploit Intelligence, Red Hat AI Inference Server, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · no fix planned: Exploit Intelligence, Red Hat AI Inference Server, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7210.json)
- **RHSA-2026:67572** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67572)
- **RHSA-2026:69069** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:69069)
- **RHSA-2026:68135** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68135)
- **RHSA-2026:68154** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68154)
- **RHSA-2026:68309** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68309)