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
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Libexpat Project | Libexpat | < 2.8.0 |
Related Weaknesses (CWE)
References
- 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 9.8 (CRITICAL). `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 CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-7210?
Check the references section above for vendor advisories and patch information. Affected products include: Libexpat Project Libexpat.