Technology · PyPI
flask (PyPI) vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 5 vulnerabilities in flask (PyPI): 0 in the last 7 days and 1 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2025-47278, was published on 7 July 2026.
- Last 7 days
- 0
- Last 90 days
- 1
- Critical, all time
- 0
- Exploited in the wild
- 0
Latest flask (PyPI) vulnerabilities
- CVE-2025-47278: PYSEC-2026-1377 - Flask uses fallback key instead of current signing keymediumCVSS 4EPSS 0.2%
- CVE-2026-27205: PYSEC-2026-2151 - Flask is a web server gateway interface (WSGI) web application framework. In versions 3.1.2 and below…mediumCVSS 4EPSS 0.4%
- CVE-2023-30861: PYSEC-2023-62 - Flask is a lightweight WSGI web application framework. When all of the following conditions are met, a…lowCVSS 3.1EPSS 1.3%
- CVE-2019-1010083: PYSEC-2019-179 - The Pallets Project Flask before 1.0 is affected by: unexpected memory usage. The impact is: denial of…lowCVSS 3.1EPSS 1.9%
- CVE-2018-1000656: PYSEC-2018-66 - The Pallets Project flask version Before 0.12.3 contains a CWE-20: Improper Input Validation…lowCVSS 3.1EPSS 3.9%
Most severe flask (PyPI) vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-27205: PYSEC-2026-2151 - Flask is a web server gateway interface (WSGI) web application framework. In versions 3.1.2 and below…mediumCVSS 4EPSS 0.4%
- CVE-2025-47278: PYSEC-2026-1377 - Flask uses fallback key instead of current signing keymediumCVSS 4EPSS 0.2%
- CVE-2018-1000656: PYSEC-2018-66 - The Pallets Project flask version Before 0.12.3 contains a CWE-20: Improper Input Validation…lowCVSS 3.1EPSS 3.9%
- CVE-2019-1010083: PYSEC-2019-179 - The Pallets Project Flask before 1.0 is affected by: unexpected memory usage. The impact is: denial of…lowCVSS 3.1EPSS 1.9%
- CVE-2023-30861: PYSEC-2023-62 - Flask is a lightweight WSGI web application framework. When all of the following conditions are met, a…lowCVSS 3.1EPSS 1.3%
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 1 | 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 |
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/flask.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, "flask (PyPI) vulnerabilities", https://junglewise.ai/threats/technologies/flask, 27 September 2026.