# CVE-2020-10735: Denial of service in python > Attackers can cause denial of service by submitting large integer strings to Python's int() function, leading to excessive CPU consumption. - **Severity:** Medium 6.2 (`CVSS:3.1/AV:L/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:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 9 Sep 2022 - **Updated:** 14 Oct 2026 - **Also known as:** ALSA-2022:7323, BIT-libpython-2020-10735, BIT-python-2020-10735, BIT-python-min-2020-10735, DEBIAN-CVE-2020-10735, GHSA-6jr7-xr67-mgxw, OESA-2022-1921, PSF-2022-4, RHSA-2022:7323, RLSA-2022:7323, UBUNTU-CVE-2020-10735, openSUSE-SU-2024:12318-1, openSUSE-SU-2024:12340-1, openSUSE-SU-2024:12342-1, openSUSE-SU-2025:14712-1 ## What is CVE-2020-10735? CVE-2020-10735 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 9 Sep 2022. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description A flaw was found in python. In algorithms with quadratic time complexity using non-binary bases, when using int("text"), a system could take 50ms to parse an int string with 100,000 digits and 5s for 1,000,000 digits (float, decimal, int.from_bytes(), and int() for binary bases 2, 4, 8, 16, and 32 are not affected). The highest threat from this vulnerability is to system availability. Weakness: CWE-704 (Incorrect Type Conversion or Cast) ## Which versions are affected by CVE-2020-10735? 3 open source packages ship an affected version, including libpython, python and python-min. It affects 5 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `libpython` | Bitnami | From 3.7.0 | 3.7.14, 3.8.14, 3.9.14, 3.10.7 | | `python` | Bitnami | From 3.7.0 | 3.7.14, 3.8.14, 3.9.14, 3.10.7 | | `python-min` | Bitnami | From 3.7.0 | 3.7.14, 3.8.14, 3.9.14, 3.10.7 | | `python-unversioned-command` | AlmaLinux:9 | All versions | 3.9.10-3.el9_0 | | `python3` | AlmaLinux:9 | All versions | 3.9.10-3.el9_0 | | `python3-debug` | AlmaLinux:9 | All versions | 3.9.10-3.el9_0 | | `python3-devel` | AlmaLinux:9 | All versions | 3.9.10-3.el9_0 | | `python3-idle` | AlmaLinux:9 | All versions | 3.9.10-3.el9_0 | | `python3-libs` | AlmaLinux:9 | All versions | 3.9.10-3.el9_0 | | `python3-test` | AlmaLinux:9 | All versions | 3.9.10-3.el9_0 | | `python3-tkinter` | AlmaLinux:9 | All versions | 3.9.10-3.el9_0 | | `python-unversioned-command` | Red Hat:enterprise_linux:9::appstream | All versions | 0:3.9.10-3.el9_0 | | `python3-devel` | Red Hat:enterprise_linux:9::appstream | All versions | 0:3.9.10-3.el9_0 | | `python3-tkinter` | Red Hat:enterprise_linux:9::appstream | All versions | 0:3.9.10-3.el9_0 | | `python3.9-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:3.9.10-3.el9_0 | | `python3.9-debugsource` | Red Hat:enterprise_linux:9::appstream | All versions | 0:3.9.10-3.el9_0 | | `python3` | Red Hat:enterprise_linux:9::baseos | All versions | 0:3.9.10-3.el9_0 | | `python3-libs` | Red Hat:enterprise_linux:9::baseos | All versions | 0:3.9.10-3.el9_0 | | `python3.9` | Red Hat:enterprise_linux:9::baseos | All versions | 0:3.9.10-3.el9_0 | | `python3.9-debuginfo` | Red Hat:enterprise_linux:9::baseos | All versions | 0:3.9.10-3.el9_0 | | `python3.9-debugsource` | Red Hat:enterprise_linux:9::baseos | All versions | 0:3.9.10-3.el9_0 | | `python3` | Red Hat:enterprise_linux:9::crb | All versions | 0:3.9.10-3.el9_0 | | `python3-debug` | Red Hat:enterprise_linux:9::crb | All versions | 0:3.9.10-3.el9_0 | | `python3-idle` | Red Hat:enterprise_linux:9::crb | All versions | 0:3.9.10-3.el9_0 | | `python3-test` | Red Hat:enterprise_linux:9::crb | All versions | 0:3.9.10-3.el9_0 | | `python3-tkinter` | Red Hat:enterprise_linux:9::crb | All versions | 0:3.9.10-3.el9_0 | | `python3.9-debuginfo` | Red Hat:enterprise_linux:9::crb | All versions | 0:3.9.10-3.el9_0 | | `python3.9-debugsource` | Red Hat:enterprise_linux:9::crb | All versions | 0:3.9.10-3.el9_0 | | `python3.9` | Rocky Linux:9 | All versions | 0:3.9.10-3.el9_0 | | `python-pydantic` | openSUSE:Tumbleweed | All versions | 2.10.6-1.1 | | `python310` | openSUSE:Tumbleweed | All versions | 3.10.7-1.2 | | `python39` | openSUSE:Tumbleweed | All versions | 3.9.14-1.1 | Products: Fedoraproject Fedora, Python Python, Redhat Enterprise Linux, Redhat Quay, Redhat Software Collections. ## How do I fix CVE-2020-10735? Upgrade libpython to a fixed version for your release line: 3.7.14, 3.8.14, 3.9.14 or 3.10.7. ## Is CVE-2020-10735 being exploited? There is no known exploitation of CVE-2020-10735 in the wild and no public exploit code. ## 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-2020-10735 and fix it if it is affected. What it is: CVE-2020-10735 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 9 Sep 2022. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2020-10735 in the wild and no public exploit code. Affected packages and fixed versions: - libpython (Bitnami): affected from 3.7.0; fixed in 3.7.14, 3.8.14, 3.9.14, 3.10.7 - python (Bitnami): affected from 3.7.0; fixed in 3.7.14, 3.8.14, 3.9.14, 3.10.7 - python-min (Bitnami): affected from 3.7.0; fixed in 3.7.14, 3.8.14, 3.9.14, 3.10.7 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-2020-10735/ (Markdown: https://insights.sbomify.com/CVE-2020-10735/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2020-10735 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-10735 - OSV: https://osv.dev/vulnerability/CVE-2020-10735 --- From sbomify Insights: https://insights.sbomify.com/CVE-2020-10735/ Summaries are generated and may contain mistakes; the official description above is the record.