USN-8524-1: Python vulnerability

unknownCVE-2026-7210

It was discovered that Python did not use sufficient entropy for Expat hash-flooding protection in the xml.parsers.expat and xml.etree.ElementTree modules. An attacker could use this to cause a denial of service via a crafted XML document.

CSIRTS triage

vendor: Python product: Python Denial of service

What: Insufficient entropy for Expat hash-flooding protection could lead to denial of service via crafted XML documents.
Who is affected: Users of Python are affected by this vulnerability.
Urgency: Remediation is necessary due to the potential for denial of service attacks.
Action: Users should apply the necessary updates to Python.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Ubuntu Security Notices (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-07-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8524-1

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-72100.79% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 52% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-7210	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

low[UPDATE] [low] CPython: Vulnerability allows Denial of Servicecert-bund