// For flags

CVE-2026-7210

The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection

Severity Score

6.3
*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

`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
\r
Fully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.

*Credits: Stan Ulbrych (https://github.com/StanFromIreland), Gregory P. Smith (https://github.com/gpshead)
CVSS Scores
Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
None
User Interaction
None
System
Vulnerable | Subsequent
Confidentiality
None
None
Integrity
None
None
Availability
Low
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2026-04-27 CVE Reserved
  • 2026-05-11 CVE Published
  • 2026-05-12 CVE Updated
  • 2026-05-12 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-331: Insufficient Entropy
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Python Software Foundation
Search vendor "Python Software Foundation"
 CPython
Search vendor "Python Software Foundation" for product "CPython"
 < 3.15.0
Search vendor "Python Software Foundation" for product "CPython" and version " < 3.15.0"
en
Affected