Critical Risk Disclosed
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.
Exploitation Probability (EPSS)
Low Priority0.06%
The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.
0% (Theoretical)100% (Certainty)
7-Day Exploitation Trend
Vulnerability Timeline
2 eventsMay 11, 2026
Vulnerability Disclosed
Published to component-level vulnerability database.
May 16, 2026
Last Updated
Record updated with new analysis or tags.
Threat Actor Attribution
PREMIUM INTELAssociated Groups:Lazarus Group, APT28
Ransomware Campaigns:LockBit 3.0, BlackCat
IoCs (Indicators):14 IPs, 3 Hashes
Remediation & Mitigation
SOLUTIONOfficial patches and mitigation steps are available for this vulnerability.
# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name
Affected Products
1 Total
libexpat_project/libexpatAll Versions
References
https://github.com/python/cpython/issues/149018GitHub
Issue Tracking
https://github.com/python/cpython/pull/149023GitHub
Issue TrackingPatch
https://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/Python
Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2026/05/11/13Openwall
Mailing ListThird Party Advisory
Am I Vulnerable?
Check your domain or package.json for CVE-2026-7210 exposure.
Vulnerability Details
CVSS Base Score
9.8/ 10
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published Date
May 11, 2026
Last Modified
May 16, 2026
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