# CVE-2026-7210

## Summary

- **CVE ID:** CVE-2026-7210
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (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)
- **CWE:** CWE-331
- **Published:** May 11, 2026
- **Last Modified:** Aug 14, 2026

## 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.

## Affected Products

- Python Software Foundation — CPython (0)
- Python Software Foundation — CPython (3.14.0)
- Python Software Foundation — CPython (3.15.0a1)
- Python Software Foundation — CPython (3.12.0)
- Python Software Foundation — CPython (3.13.0)

## References

- [CNA](https://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/)
- [CNA](https://github.com/python/cpython/pull/149023)
- [CNA](https://github.com/python/cpython/issues/149018)
- [CVE](http://www.openwall.com/lists/oss-security/2026/05/11/8)
- [CVE](http://www.openwall.com/lists/oss-security/2026/05/11/13)
- [CNA](https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4)
- [CNA](https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566)
- [CNA](https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27a)
- [CNA](https://github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145f)
- [CNA](https://github.com/python/cpython/commit/e37df2a6a71d6538698e2d3188a7c345b827640b)
- [CNA](https://github.com/python/cpython/commit/cbaecf9f16da611a646d507c1cbca265c588fc56)
- [CNA](https://github.com/python/cpython/commit/ea70712d1a8508e14e9677d44f838dab04dc0286)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.67%
- **EPSS Percentile:** 49.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._