CVE-2026-7210CWE-331

CVE-2026-7210

High · published May 11, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
51.5
In the wild
Unconfirmed
What it is

`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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00672 · 51.5th percentile
Weakness
CWE-331 · Insufficient Entropy
Published
2026-05-11T22:16Z
Affected products (11)
ProductVersionsFixed in
python/python< 3.13.143.13.14
python/python≥ 3.14.0, < 3.14.63.14.6
python/pythonall versions—
python/pythonall versions—
python/pythonall versions—
python/pythonall versions—
python/pythonall versions—
python/pythonall versions—
python/pythonall versions—
python/pythonall versions—
python/pythonall versions—
References (12)
https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4 · [email protected]https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566 · [email protected]https://github.com/python/cpython/commit/cbaecf9f16da611a646d507c1cbca265c588fc56 · [email protected]https://github.com/python/cpython/commit/e37df2a6a71d6538698e2d3188a7c345b827640b · [email protected]https://github.com/python/cpython/commit/ea70712d1a8508e14e9677d44f838dab04dc0286 · [email protected]https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27a · [email protected]https://github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145f · [email protected]https://github.com/python/cpython/issues/149018 · [email protected]https://github.com/python/cpython/pull/149023 · [email protected]https://mail.python.org/archives/list/[email protected]/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/ · [email protected]http://www.openwall.com/lists/oss-security/2026/05/11/13 · af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/05/11/8 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 11 MAY 17:19Z
    The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection
    cvelistv5