CVE-2026-7210

CRITICAL

`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.

CVSS v3.1 Score

9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Published: 5/11/2026Modified: 5/16/2026

Related Intelligence (1)

CRITICALVulnerability

NVD CRITICAL: CVE-2026-7210 — `xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Exp...

`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.

CVE-2026-7210
NIST NVD

References (5)

https://github.com/python/cpython/issues/149018Issue Trackinghttps://github.com/python/cpython/pull/149023Issue TrackingPatchhttps://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/Mailing ListThird Party Advisoryhttp://www.openwall.com/lists/oss-security/2026/05/11/13Mailing ListThird Party Advisoryhttp://www.openwall.com/lists/oss-security/2026/05/11/8Mailing ListThird Party Advisory