# CVE-2022-45061: Denial of service in n/a > A malicious hostname can cause excessive CPU consumption in the Python IDNA decoder, leading to a denial of service on the client. - **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 9 Nov 2022 - **Updated:** 14 Oct 2026 - **Also known as:** ALPINE-CVE-2022-45061, ALSA-2023:0953, ALSA-2023:2860, AZL-109644, AZL-11439, AZL-83613, BIT-libpython-2022-45061, BIT-python-2022-45061, BIT-python-min-2022-45061, CLEANSTART-2026-CJ02414, CLSA-2022-1669236630, CLSA-2022-1669237532, CLSA-2022-1669237735, CLSA-2022-1669238513, CLSA-2022-1669238752, CLSA-2022-1669240479, CLSA-2022-1669241032, CLSA-2022-1669241475, DEBIAN-CVE-2022-45061, GHSA-2mp6-9mjc-p6jg, OESA-2022-2102, PSF-2022-10, RHSA-2023:0953, RHSA-2023:2860, RLSA-2023:0953, RLSA-2023:2860, SUSE-SU-2022:4258-1, SUSE-SU-2022:4275-1, SUSE-SU-2023:0213-1, SUSE-SU-2023:0549-1, SUSE-SU-2023:0616-1, UBUNTU-CVE-2022-45061, USN-5767-2, openSUSE-SU-2024:12495-1, openSUSE-SU-2024:12500-1, openSUSE-SU-2024:12501-1, openSUSE-SU-2024:12502-1, openSUSE-SU-2024:12503-1 ## What is CVE-2022-45061? CVE-2022-45061 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 9 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description 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. Weakness: CWE-407 (Inefficient Algorithmic Complexity) ## Which versions are affected by CVE-2022-45061? 3 open source packages ship an affected version, including libpython, python and python-min. It affects 9 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `libpython` | Bitnami | All versions | 3.7.16, 3.10.9, 3.11.1, 3.8.16, 3.9.16 | | `python` | Bitnami | All versions | 3.7.16, 3.10.9, 3.11.1, 3.8.16, 3.9.16 | | `python-min` | Bitnami | All versions | 3.7.16, 3.10.9, 3.11.1, 3.8.16, 3.9.16 | | `babel` | AlmaLinux:8 | All versions | 2.5.1-10.module_el8.6.0+2781+fed64c13 | | `python-nose-docs` | AlmaLinux:8 | All versions | 1.3.7-31.module_el8.6.0+2781+fed64c13 | | `python-psycopg2-doc` | AlmaLinux:8 | All versions | 2.7.5-7.module_el8.6.0+2781+fed64c13 | | `python-psycopg2-doc` | AlmaLinux:8 | All versions | 2.7.5-7.module_el8.6.0+3162+01a09e5a | | `python-sqlalchemy-doc` | AlmaLinux:8 | All versions | 1.3.2-2.module_el8.6.0+2781+fed64c13 | | `python2` | AlmaLinux:8 | All versions | 2.7.18-12.module_el8.8.0+3480+108b5990.alma | | `python2-Cython` | AlmaLinux:8 | All versions | 0.28.1-7.module_el8.6.0+2781+fed64c13 | | `python2-Cython` | AlmaLinux:8 | All versions | 0.28.1-7.module_el8.6.0+3162+01a09e5a | | `python2-PyMySQL` | AlmaLinux:8 | All versions | 0.8.0-10.module_el8.6.0+2781+fed64c13 | | `python2-attrs` | AlmaLinux:8 | All versions | 17.4.0-10.module_el8.6.0+2781+fed64c13 | | `python2-babel` | AlmaLinux:8 | All versions | 2.5.1-10.module_el8.6.0+2781+fed64c13 | | `python2-backports` | AlmaLinux:8 | All versions | 1.0-16.module_el8.6.0+2781+fed64c13 | | `python2-backports` | AlmaLinux:8 | All versions | 1.0-16.module_el8.6.0+3162+01a09e5a | | `python2-backports-ssl_match_hostname` | AlmaLinux:8 | All versions | 3.5.0.1-12.module_el8.6.0+2781+fed64c13 | | `python2-bson` | AlmaLinux:8 | All versions | 3.7.0-1.module_el8.6.0+2781+fed64c13 | | `python2-bson` | AlmaLinux:8 | All versions | 3.7.0-1.module_el8.6.0+3162+01a09e5a | | `python2-chardet` | AlmaLinux:8 | All versions | 3.0.4-10.module_el8.6.0+2781+fed64c13 | | `python2-coverage` | AlmaLinux:8 | All versions | 4.5.1-4.module_el8.6.0+2781+fed64c13 | | `python2-coverage` | AlmaLinux:8 | All versions | 4.5.1-4.module_el8.6.0+3162+01a09e5a | | `python2-debug` | AlmaLinux:8 | All versions | 2.7.18-12.module_el8.8.0+3480+108b5990.alma | | `python2-devel` | AlmaLinux:8 | All versions | 2.7.18-12.module_el8.8.0+3480+108b5990.alma | | `python2-dns` | AlmaLinux:8 | All versions | 1.15.0-10.module_el8.6.0+2781+fed64c13 | | `python2-docs` | AlmaLinux:8 | All versions | 2.7.16-2.module_el8.6.0+2781+fed64c13 | | `python2-docs-info` | AlmaLinux:8 | All versions | 2.7.16-2.module_el8.6.0+2781+fed64c13 | | `python2-docutils` | AlmaLinux:8 | All versions | 0.14-12.module_el8.6.0+2781+fed64c13 | | `python2-funcsigs` | AlmaLinux:8 | All versions | 1.0.2-13.module_el8.6.0+2781+fed64c13 | | `python2-idna` | AlmaLinux:8 | All versions | 2.5-7.module_el8.6.0+2781+fed64c13 | | `python2-ipaddress` | AlmaLinux:8 | All versions | 1.0.18-6.module_el8.6.0+2781+fed64c13 | | `python2-jinja2` | AlmaLinux:8 | All versions | 2.10-9.module_el8.6.0+2781+fed64c13 | | `python2-libs` | AlmaLinux:8 | All versions | 2.7.18-12.module_el8.8.0+3480+108b5990.alma | | `python2-lxml` | AlmaLinux:8 | All versions | 4.2.3-6.module_el8.6.0+2781+fed64c13 | | `python2-lxml` | AlmaLinux:8 | All versions | 4.2.3-6.module_el8.6.0+3162+01a09e5a | | `python2-markupsafe` | AlmaLinux:8 | All versions | 0.23-19.module_el8.6.0+2781+fed64c13 | | `python2-markupsafe` | AlmaLinux:8 | All versions | 0.23-19.module_el8.6.0+3162+01a09e5a | | `python2-mock` | AlmaLinux:8 | All versions | 2.0.0-13.module_el8.6.0+2781+fed64c13 | | `python2-nose` | AlmaLinux:8 | All versions | 1.3.7-31.module_el8.6.0+2781+fed64c13 | | `python2-numpy` | AlmaLinux:8 | All versions | 1:1.14.2-16.module_el8.6.0+2781+fed64c13 | Products: Fedoraproject Fedora, Netapp Active Iq Unified Manager, Netapp Bootstrap Os, Netapp E-Series Performance Analyzer, Netapp Element Software, Netapp Hci, Netapp Management Services for Element Software, Netapp Ontap Select Deploy Administration Utility, Python Python. ## How do I fix CVE-2022-45061? Upgrade libpython to a fixed version for your release line: 3.7.16, 3.10.9, 3.11.1 or 3.8.16. ## Is CVE-2022-45061 being exploited? It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-45061 exists. ## Other vulnerabilities in Fedoraproject Fedora - [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild) - [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild) - [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2022-45061 and fix it if it is affected. What it is: CVE-2022-45061 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 9 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-45061 exists. Affected packages and fixed versions: - libpython (Bitnami): affected all versions; fixed in 3.7.16, 3.10.9, 3.11.1, 3.8.16, 3.9.16 - python (Bitnami): affected all versions; fixed in 3.7.16, 3.10.9, 3.11.1, 3.8.16, 3.9.16 - python-min (Bitnami): affected all versions; fixed in 3.7.16, 3.10.9, 3.11.1, 3.8.16, 3.9.16 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2022-45061/ (Markdown: https://insights.sbomify.com/CVE-2022-45061/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2022-45061 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-45061 - OSV: https://osv.dev/vulnerability/CVE-2022-45061 --- From sbomify Insights: https://insights.sbomify.com/CVE-2022-45061/ Summaries are generated and may contain mistakes; the official description above is the record.