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Ubuntu 26.04 LTS Python-idna Important DoS Issue 8549-1

ubuntu
Calendar Grey July 15, 2026
Dist Ubuntu Esm H88
A significant security issue affects Ubuntu systems involving idna, which can lead to resource consumption with crafted input.
idna could be made to consume resources if it received specially crafted input.

Summary

idna could be made to consume resources if it received specially crafted

input.

Software Description:

- python-idna: Python IDNA2008 (RFC 5891) handling

Details:

It was discovered that idna did not properly reject oversized inputs before

performing expensive processing. An attacker could possibly use this issue

to cause idna to consume significant resources, leading to a denial of

service.

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important python idna

Update Instructions

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

Ubuntu 26.04 LTS
  python3-idna                    3.11-1ubuntu0.1

Ubuntu 24.04 LTS
  python3-idna                    3.6-2ubuntu0.2

Ubuntu 22.04 LTS
  python3-idna                    3.3-1ubuntu0.2

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

References

https://ubuntu.com/security/notices/USN-8549-1

CVE-2026-45409

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8549-1

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important python idna

Package Information

https://launchpad.net/ubuntu/+source/python-idna/3.11-1ubuntu0.1
https://launchpad.net/ubuntu/+source/python-idna/3.6-2ubuntu0.2
https://launchpad.net/ubuntu/+source/python-idna/3.3-1ubuntu0.2

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