CVE-2026-7210

Summary

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.

Affected Software

Weaknesses

• CWE-331: CWE-331 Insufficient entropy

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

CVE Program Container

Additional References

• http://www.openwall.com/lists/oss-security/2026/05/11/8
• http://www.openwall.com/lists/oss-security/2026/05/11/13

References

• https://mail.python.org/archives/list/security-announce@python.org/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

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