CVE-2022-45061

An issue was discovered in Python before 3.11.1. An unnecessary quadratic algorithm exists in one path when processing some inputs to the IDNA (RFC 3490) decoder, such that a crafted, unreasonably long name being presented to the decoder could lead to a CPU denial of service. Hostnames are often supplied by remote servers that could be controlled by a malicious actor; in such a scenario, they could trigger excessive CPU consumption on the client attempting to make use of an attacker-supplied supposed hostname. For example, the attack payload could be placed in the Location header of an HTTP response with status code 302. A fix is planned in 3.11.1, 3.10.9, 3.9.16, 3.8.16, and 3.7.16.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
python	22.10 kinetic	Not in release
	22.04 LTS jammy	Not in release
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Ignored end of standard support
	14.04 LTS trusty	Ignored end of standard support
python2.7	24.10 oracular	Not in release
	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	23.04 lunar	Not in release
	22.10 kinetic	Ignored end of life, was needs-triage
	22.04 LTS jammy	Fixed 2.7.18-13ubuntu1.5+esm3 Ubuntu Pro
	20.04 LTS focal	Fixed 2.7.18-1~20.04.7+esm4 Ubuntu Pro
	18.04 LTS bionic	Fixed 2.7.17-1~18.04ubuntu1.10
	16.04 LTS xenial	Fixed 2.7.12-1ubuntu0~16.04.18+esm3 Ubuntu Pro
	14.04 LTS trusty	Fixed 2.7.6-8ubuntu0.6+esm13 Ubuntu Pro
python3.10	24.10 oracular	Not in release
	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	23.04 lunar	Not in release
	22.10 kinetic	Fixed 3.10.7-1ubuntu0.2
	22.04 LTS jammy	Fixed 3.10.6-1~22.04.2
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
python3.11	24.10 oracular	Not in release
	24.04 LTS noble	Not in release
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Ignored end of life, was needed
	22.04 LTS jammy	Vulnerable
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
python3.4	22.10 kinetic	Not in release
	22.04 LTS jammy	Not in release
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Ignored end of ESM support, was needed
python3.5	22.10 kinetic	Not in release
	22.04 LTS jammy	Not in release
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Fixed 3.5.2-2ubuntu0~16.04.13+esm6 Ubuntu Pro
	14.04 LTS trusty	Fixed 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1 Ubuntu Pro
python3.6	22.10 kinetic	Not in release
	22.04 LTS jammy	Not in release
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Fixed 3.6.9-1~18.04ubuntu1.9
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
python3.7	22.10 kinetic	Not in release
	22.04 LTS jammy	Not in release
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Fixed 3.7.5-2ubuntu1~18.04.2+esm3 Ubuntu Pro
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
python3.8	22.10 kinetic	Not in release
	22.04 LTS jammy	Not in release
	20.04 LTS focal	Fixed 3.8.10-0ubuntu1~20.04.6
	18.04 LTS bionic	Fixed 3.8.0-3ubuntu1~18.04.2+esm2 Ubuntu Pro
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
python3.9	22.10 kinetic	Not in release
	22.04 LTS jammy	Not in release
	20.04 LTS focal	Fixed 3.9.5-3ubuntu0~20.04.1+esm1 Ubuntu Pro
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
python3.10	Upstream: 9bb8e18
python3.11	Upstream: a6f6c3a
python3.7	Upstream: b0b590b

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-5767-1
Python vulnerabilities
8 December 2022

USN-5767-2
Python vulnerability
8 December 2022

USN-5888-1
Python vulnerabilities
27 February 2023

USN-6891-1
Python vulnerabilities
11 July 2024

USN-7212-1
Python 2.7 vulnerabilities
16 January 2025