CVE-2026-7210CRITICAL 7.5EPSS p51.5%

CVE-2026-7210CVE-2026-7210

python / python

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.

Scoring

CVSS 3.17.5 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS0.79% probability of exploitation · percentile 51.5% · 2026-06-19T12:03:05Z
Published2026-05-11
Last modified2026-06-15

Underlying weaknesses· 1

CWE-331

References

  1. https://github.com/python/cpython/issues/149018
  2. https://github.com/python/cpython/pull/149023
  3. https://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/
  4. http://www.openwall.com/lists/oss-security/2026/05/11/13
  5. http://www.openwall.com/lists/oss-security/2026/05/11/8

1

TypeTargetConfidenceTier
WeaknessInsufficient Entropycwe-3310%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.