flask has 3 CVEs on record between 2023 and 2026. The median CVSS is 7.5 (high).
CVEs per month
Last 12 months, by publish date
1025/101125/111225/120126/010226/020326/030426/040526/050626/060726/070826/080926/09
- Exploited share
- 0% vs 1% corpus
- Median CVSS
- 7.5
- Publish → KEV
- —
- Last 90 days
- 0 prev 0
Products
- flask 3
3
Total CVEs
0
Critical
0
CISA KEV
0
Exploited
Worst active — by depth score
flask vulnerabilities
CVEs affecting flask, newest first. Open any entry for full detail, references, and exploit status.
3 CVEsRSS
CVE-2026-27205LowFlask session does not add `Vary: Cookie` header when accessed in some ways
Flask session does not add `Vary: Cookie` header when accessed in some ways
▾ Sunlitflask · flaskEPSS 0.36%via OSV
CVE-2025-47278LowFlask uses fallback key instead of current signing key
Flask uses fallback key instead of current signing key
▾ Sunlitflask · flaskEPSS 0.18%via OSV
CVE-2023-30861High· 7.5PoCFlask vulnerable to possible disclosure of permanent session cookie due to missing Vary: Cookie header
Flask vulnerable to possible disclosure of permanent session cookie due to missing Vary: Cookie header
▾ Midnightflask · flaskEPSS 1.3%via OSV