Flask
6 CVEs tracked. None of them is in CISA KEV.
This hub aggregates every CVE we track for Flask, a product in the oss libraries space. Use it to gauge the current risk picture and drill into individual advisories.
Flask CVEs per month
| Month | CVEs |
|---|---|
| 2024-10 | 0 |
| 2024-11 | 0 |
| 2024-12 | 0 |
| 2025-01 | 0 |
| 2025-02 | 0 |
| 2025-03 | 0 |
| 2025-04 | 0 |
| 2025-05 | 1 |
| 2025-06 | 0 |
| 2025-07 | 0 |
| 2025-08 | 0 |
| 2025-09 | 0 |
| 2025-10 | 0 |
| 2025-11 | 0 |
| 2025-12 | 0 |
| 2026-01 | 0 |
| 2026-02 | 1 |
| 2026-03 | 0 |
| 2026-04 | 0 |
| 2026-05 | 0 |
| 2026-06 | 0 |
| 2026-07 | 0 |
| 2026-08 | 0 |
| 2026-09 | 0 |
Severity
How the 6 CVEs score on CVSS. Severity is not exploitation: KEV is counted above.
- High3
- Medium2
Latest CVEs
The 6 most recently published vulnerabilities affecting Flask.
- CVE-2026-27205Flask session does not add `Vary: Cookie` header when accessed in some ways4.3
- CVE-2025-47278Flask uses fallback key instead of current signing key—
- CVE-2024-1681Log Injection Vulnerability in corydolphin/flask-cors5.3
- CVE-2023-30861Flask vulnerable to possible disclosure of permanent session cookie due to missing Vary: Cookie header7.5
- CVE-2019-1010083The Pallets Project Flask before 1.0 is affected by: unexpected memory usage. The impact is: denial of service. The attack vector is: crafted encoded JSON data. The fixed version is: 1. NOTE: this ...7.5
- CVE-2018-1000656The Pallets Project flask version Before 0.12.3 contains a CWE-20: Improper Input Validation vulnerability in flask that can result in Large amount of memory usage possibly leading to denial of ser...7.5
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