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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.

PUBLISHED Reserved 2026-04-27 | Published 2026-05-11 | Updated 2026-05-11 | Assigner PSF




MEDIUM: 6.3CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Problem types

CWE-331 Insufficient entropy

Product status

Default status
unaffected

Any version before 3.15.0
affected

Credits

Stan Ulbrych (https://github.com/StanFromIreland) coordinator

Gregory P. Smith (https://github.com/gpshead) remediation reviewer

References

www.openwall.com/lists/oss-security/2026/05/11/8

www.openwall.com/lists/oss-security/2026/05/11/13

mail.python.org/.../thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/ vendor-advisory

github.com/python/cpython/pull/149023 patch

github.com/python/cpython/issues/149018 issue-tracking

cve.org (CVE-2026-7210)

nvd.nist.gov (CVE-2026-7210)

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