Technology · PyPI
PyYAML (PyPI) vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 5 vulnerabilities in PyYAML (PyPI): 0 in the last 7 days and 0 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2020-14343, was published on 9 February 2021.
- Last 7 days
- 0
- Last 90 days
- 0
- Critical, all time
- 1
- Exploited in the wild
- 0
About PyYAML (PyPI)
A YAML parser and emitter for the Python programming language.
Latest PyYAML (PyPI) vulnerabilities
- CVE-2020-14343: PYSEC-2021-142 - A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to…lowCVSS 3.1EPSS 6.0%
- CVE-2020-1747: PYSEC-2020-96 - A vulnerability was discovered in the PyYAML library in versions before 5.3.1, where it is susceptible to…lowCVSS 3.1EPSS 5.4%
- CVE-2019-20477: PYSEC-2020-176 - PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a…lowCVSS 3.1EPSS 5.1%
- PYSEC-2020-195 - PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class…info
- CVE-2017-18342: PyYAML insecure deserialization in yaml.load APIcriticalCVSS 9.8EPSS 5.7%
Most severe PyYAML (PyPI) vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2017-18342: PyYAML insecure deserialization in yaml.load APIcriticalCVSS 9.8EPSS 5.7%
- CVE-2020-14343: PYSEC-2021-142 - A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to…lowCVSS 3.1EPSS 6.0%
- CVE-2020-1747: PYSEC-2020-96 - A vulnerability was discovered in the PyYAML library in versions before 5.3.1, where it is susceptible to…lowCVSS 3.1EPSS 5.4%
- CVE-2019-20477: PYSEC-2020-176 - PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a…lowCVSS 3.1EPSS 5.1%
- PYSEC-2020-195 - PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class…info
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 6 Jul 2026 | 0 | 0 | |
| 13 Jul 2026 | 0 | 0 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 0 | 0 | |
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 0 | 0 |
How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/pyyaml.json, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "PyYAML (PyPI) vulnerabilities", https://junglewise.ai/threats/technologies/pyyaml, 28 September 2026.