CVE-2026-7210
The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection
CVSS 4.0 6.3 MEDIUMCheck source for fixed versionsKEV status unknown
Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.
cve-program · CVE-2026-7210
Published`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.
Read the publisher's advisoryAffected versions, risk and source history
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CVE-2026-7210 · CVE overview and exploitation status
cve-program · CVE-2026-7210
- https://mail.python.org/archives/list/[email protected]/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/
- https://github.com/python/cpython/pull/149023
- https://github.com/python/cpython/issues/149018
- https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4
- https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566
- https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27a
- https://github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145f
- https://github.com/python/cpython/commit/e37df2a6a71d6538698e2d3188a7c345b827640b
- https://github.com/python/cpython/commit/cbaecf9f16da611a646d507c1cbca265c588fc56
- https://github.com/python/cpython/commit/ea70712d1a8508e14e9677d44f838dab04dc0286
This historical advisory does not include today's related changes. Open the latest advisory to find current connections.