Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Python | Python | < 3.13.14 |
Related Weaknesses (CWE)
References
- https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391ePatch
- https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b256Patch
- https://github.com/python/cpython/commit/cbaecf9f16da611a646d507c1cbca265c588fc5
- https://github.com/python/cpython/commit/e37df2a6a71d6538698e2d3188a7c345b827640
- https://github.com/python/cpython/commit/ea70712d1a8508e14e9677d44f838dab04dc028
- https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27Patch
- https://github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145Patch
- https://github.com/python/cpython/issues/149018Issue Tracking
- https://github.com/python/cpython/pull/149023Issue TrackingPatch
- https://mail.python.org/archives/list/[email protected]/thread/PNY5OMMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/05/11/13Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/05/11/8Mailing ListThird Party Advisory
FAQ
What is CVE-2026-7210?
CVE-2026-7210 is a vulnerability with a CVSS score of 7.5 (HIGH). `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 ...
How severe is CVE-2026-7210?
CVE-2026-7210 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-7210?
Check the references section above for vendor advisories and patch information. Affected products include: Python Python.