CVE-2026-7210
Medium
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.
SeverityMedium
CVSS6.3
Exploit probability52. percentile0.7%
Product
Python
PublishedMay 11, 2026
First seenMay 11, 2026
Weakness typeCWE-331CWE-331
How to fix
Update
- python python3.13.14, 3.14.6 or later
Patches
- github.com/python/cpython/pull/149023
- github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4
- github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566
- github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27a
- github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145f
- github.com/python/cpython/commit/e37df2a6a71d6538698e2d3188a7c345b827640b
- github.com/python/cpython/commit/cbaecf9f16da611a646d507c1cbca265c588fc56
- github.com/python/cpython/commit/ea70712d1a8508e14e9677d44f838dab04dc0286
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| python python | v < 3.13.14, 3.14.0 ≤ v < 3.14.6, 3.15.0 | 3.13.14, 3.14.6 |
| microsoft azl3_python3_3.12.9-10 | No range specified | — |
| microsoft azl3_python3_3.12.9-11 | No range specified | — |
| microsoft azl3_python3_3.12.9-13 | No range specified | — |
| microsoft azl3_python3_3.12.9-14 | No range specified | — |
| microsoft azl3_python3_3.12.14-1 | No range specified | — |
| microsoft azl3_expat_2.6.4-6 | No range specified | — |
| microsoft azl3_python3_3.12.14-2 | No range specified | — |
| microsoft azl3_python3_3.12.16-1 | No range specified | — |
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