# CVE-2020-29651: py vulnerable to Regular Expression Denial of Service > Attackers can cause a compute-time denial of service in the py.path.svnwc component by supplying malicious input to the blame functionality. - **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 Dec 2020 - **Updated:** 3 Nov 2025 - **Also known as:** DEBIAN-CVE-2020-29651, GHSA-hj5v-574p-mj7c, MGASA-2021-0071, OESA-2022-1562, PYSEC-2020-92, SUSE-SU-2021:1859-1, SUSE-SU-2021:2236-1, SUSE-SU-2022:2831-1, UBUNTU-CVE-2020-29651, USN-5138-1, openSUSE-SU-2021:0851-1, openSUSE-SU-2021:1859-1, openSUSE-SU-2024:11252-1, openSUSE-SU-2024:14153-1 ## What is CVE-2020-29651? CVE-2020-29651 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 9 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description A denial of service via regular expression in the py.path.svnwc component of py (aka python-py) through 1.9.0 could be used by attackers to cause a compute-time denial of service attack by supplying malicious input to the blame functionality. ## Which versions are affected by CVE-2020-29651? 3 open source packages ship an affected version, including py. It affects 3 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `py` | PyPI | All versions | 1.10.0 | | `py` | PyPI | All versions | 1.10.0 | | `py` | PyPI | All versions | 1.10.0 | | `python-py` | SUSE:Linux Enterprise Micro 5.0 | All versions | 1.8.1-5.6.1 | | `python-py` | SUSE:Linux Enterprise Micro 5.1 | All versions | 1.10.0-150000.5.9.2 | | `python-py` | SUSE:Linux Enterprise Micro 5.2 | All versions | 1.10.0-150000.5.9.2 | | `python-py` | SUSE:Linux Enterprise Module for Basesystem 15 SP2 | All versions | 1.8.1-5.6.1 | | `python-apipkg` | SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 1.4-150000.3.2.1 | | `python-iniconfig` | SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 1.1.1-150000.1.3.1 | | `python-py` | SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 1.10.0-150000.5.9.2 | | `python-py` | SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 1.8.1-5.6.1 | | `python-apipkg` | SUSE:Linux Enterprise Module for Basesystem 15 SP4 | All versions | 1.4-150000.3.2.1 | | `python-iniconfig` | SUSE:Linux Enterprise Module for Basesystem 15 SP4 | All versions | 1.1.1-150000.1.3.1 | | `python-py` | SUSE:Linux Enterprise Module for Basesystem 15 SP4 | All versions | 1.10.0-150000.5.9.2 | | `python-coverage` | SUSE:Linux Enterprise Module for Development Tools 15 SP3 | All versions | 4.5.4-150000.3.3.2 | | `python-coverage` | SUSE:Linux Enterprise Module for Development Tools 15 SP4 | All versions | 4.5.4-150000.3.3.2 | | `python-atomicwrites` | SUSE:Linux Enterprise Module for Package Hub 15 SP3 | All versions | 1.1.5-150000.3.2.1 | | `python-coverage` | SUSE:Linux Enterprise Module for Package Hub 15 SP3 | All versions | 4.5.4-150000.3.3.2 | | `python-atomicwrites` | SUSE:Linux Enterprise Module for Package Hub 15 SP4 | All versions | 1.1.5-150000.3.2.1 | | `python-coverage` | SUSE:Linux Enterprise Module for Package Hub 15 SP4 | All versions | 4.5.4-150000.3.3.2 | | `python-atomicwrites` | SUSE:Linux Enterprise Module for Public Cloud 15 SP1 | All versions | 1.1.5-150000.3.2.1 | | `python-atomicwrites` | SUSE:Linux Enterprise Module for Public Cloud 15 SP2 | All versions | 1.1.5-150000.3.2.1 | | `python-atomicwrites` | SUSE:Linux Enterprise Module for Public Cloud 15 SP3 | All versions | 1.1.5-150000.3.2.1 | | `python-atomicwrites` | SUSE:Linux Enterprise Module for Public Cloud 15 SP4 | All versions | 1.1.5-150000.3.2.1 | | `python-py` | SUSE:Linux Enterprise Module for Python 2 15 SP2 | All versions | 1.8.1-5.6.1 | | `python-apipkg` | SUSE:Linux Enterprise Module for Python 2 15 SP3 | All versions | 1.4-150000.3.2.1 | | `python-iniconfig` | SUSE:Linux Enterprise Module for Python 2 15 SP3 | All versions | 1.1.1-150000.1.3.1 | | `python-py` | SUSE:Linux Enterprise Module for Python 2 15 SP3 | All versions | 1.10.0-150000.5.9.2 | | `python-py` | SUSE:Linux Enterprise Module for Python 2 15 SP3 | All versions | 1.8.1-5.6.1 | | `python-py` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 1.8.1-11.12.4 | | `python-py` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 1.8.1-11.12.4 | | `python-py` | SUSE:OpenStack Cloud 7 | All versions | 1.8.1-11.12.4 | | `python-py` | openSUSE:Leap 15.2 | All versions | 1.8.1-lp152.2.6.1 | | `python-py-test` | openSUSE:Leap 15.2 | All versions | 1.8.1-lp152.2.6.1 | | `python-apipkg` | openSUSE:Leap 15.3 | All versions | 1.4-150000.3.2.1 | | `python-atomicwrites` | openSUSE:Leap 15.3 | All versions | 1.1.5-150000.3.2.1 | | `python-atomicwrites-doc` | openSUSE:Leap 15.3 | All versions | 1.1.5-150000.3.2.1 | | `python-coverage` | openSUSE:Leap 15.3 | All versions | 4.5.4-150000.3.3.2 | | `python-py` | openSUSE:Leap 15.3 | All versions | 1.10.0-150000.5.9.2 | | `python-py` | openSUSE:Leap 15.3 | All versions | 1.8.1-5.6.1 | Products: Fedoraproject Fedora, Oracle Zfs Storage Appliance Kit, Pytest Py. ## How do I fix CVE-2020-29651? Upgrade py to 1.10.0 or later. ## Is CVE-2020-29651 being exploited? There is no known exploitation of CVE-2020-29651 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-2020-29651 and fix it if it is affected. What it is: CVE-2020-29651 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 9 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2020-29651 in the wild and no public exploit code. Affected packages and fixed versions: - py (PyPI): affected all versions; fixed in 1.10.0 - py (PyPI): affected all versions; fixed in 1.10.0 - py (PyPI): affected all versions; fixed in 1.10.0 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-2020-29651/ (Markdown: https://insights.sbomify.com/CVE-2020-29651/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2020-29651 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-29651 - OSV: https://osv.dev/vulnerability/CVE-2020-29651 --- From sbomify Insights: https://insights.sbomify.com/CVE-2020-29651/ Summaries are generated and may contain mistakes; the official description above is the record.