CVE-2026-7210

`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-331

• https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4Patch
• https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566Patch
• https://github.com/python/cpython/commit/e37df2a6a71d6538698e2d3188a7c345b827640b
• https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27aPatch
• https://github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145fPatch
• https://github.com/python/cpython/issues/149018Issue Tracking
• https://github.com/python/cpython/pull/149023Issue Tracking, Patch
• https://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2026/05/11/13Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2026/05/11/8Mailing List, Third Party Advisory

Published

May 11, 2026

Last Modified

Aug 12, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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