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Critical DoS Vulnerabilities in Python for Ubuntu 25.10 USN-7886-2

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Calendar Grey November 26, 2025
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Critical security issues in Python for Ubuntu 25.04 and 25.10 require immediate updates. Learn more about the risks.
Several security issues were fixed in Python.

Summary

Several security issues were fixed in Python.

Software Description:

- python3.13: An interactive high-level object-oriented language

Details:

USN-7886-1 fixed vulnerabilities in Python. This update provides the

corresponding updates for python3.13 in Ubuntu 25.04 and Ubuntu 25.10.

Original advisory details:

It was discovered that Python inefficiently handled expanding system

environment variables. An attacker could possibly use this issue to cause

Python to consume excessive resources, leading to a denial of service.

(CVE-2025-6075)

Caleb Brown discovered that Python incorrectly handled the ZIP64 End of

Central Directory (EOCD) Locator record offset value. An attacker could

possibly use this issue to obfuscate malicious content. (CVE-2025-8291)

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu attack python3

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
  libpython3.13                   3.13.7-1ubuntu0.1
  python3.13                      3.13.7-1ubuntu0.1

Ubuntu 25.04
  libpython3.13                   3.13.3-1ubuntu0.4
  python3.13                      3.13.3-1ubuntu0.4

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-7886-2

https://ubuntu.com/security/notices/USN-7886-1

CVE-2025-6075, CVE-2025-8291

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7886-2

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu attack python3

Package Information

https://launchpad.net/ubuntu/+source/python3.13/3.13.7-1ubuntu0.1

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