pallets flask
3 published vulnerabilities name this product.
As the CNAs write it in their CVE records (vendor and product); the versions are theirs.
| CVE | Vulnerable versions | Title | Severity | Published | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| CVE-2026-27205 | < 3.1.3 | Flask session does not add `Vary: Cookie` header when accessed in some ways | LOW 2.3 | 0.4 % | ||
| CVE-2025-47278 | = 3.1.0 | Flask uses fallback key instead of current signing key | LOW 1.8 | 0.2 % | ||
| CVE-2023-30861 | >= 2.3.0, < 2.3.2 ; < 2.2.5 | Flask vulnerable to possible disclosure of permanent session cookie due to missing Vary: Cookie header | HIGH 7.5 | 1.3 % |