CVE-2026-7210
The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
`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.
| CWE | CWE-331 |
| Vendor | python software foundation |
| Product | cpython |
| Published | May 11, 2026 |
| Last Updated | May 11, 2026 |
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Affected Versions
Python Software Foundation / CPython
0 < 3.15.0
References
mail.python.org: https://mail.python.org/archives/list/[email protected]/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/ github.com: https://github.com/python/cpython/pull/149023 github.com: https://github.com/python/cpython/issues/149018 openwall.com: http://www.openwall.com/lists/oss-security/2026/05/11/8 openwall.com: http://www.openwall.com/lists/oss-security/2026/05/11/13
Credits
Stan Ulbrych (https://github.com/StanFromIreland) Gregory P. Smith (https://github.com/gpshead)