StackPrism

PyPI package

Flask 3.0.2 vulnerability, and the version that fixes it

Flask 3.0.2 has 1 known vulnerability; 3.1.3 fixes it.

PyPI (opens in a new tab) describes it as “A simple framework for building complex web applications.”

Known vulnerabilities
1
None rated high or critical
Released
Feb 3, 2024
Latest is 3.1.3
Licence
BSD-3-Clause
OpenSSF Scorecard
7.1/10
pallets/flask (opens in a new tab)
Pulls in
6 packages
Resolved by deps.dev

What to upgrade to

3.1.3 is the closest release with no known vulnerabilities.

  • 3.1.3Upgrade to this

    Fixes the known vulnerability and the newest 3.x release and the latest release. Released Feb 19, 2026.

    No known vulnerabilities

3.1.3 came out on Feb 19, 2026. A coding agent trained before then doesn’t know it exists, so it may suggest an older release. AI knowledge cutoff dates

Findings

Every advisory for Flask 3.0.2

Known exploited first (CISA KEV), then by how likely they are to be exploited (FIRST EPSS), then by severity. Each id links to its OSV.dev record.

  1. LowCVE-2026-27205 on OSV.dev (opens in a new tab)GHSA-68rp-wp8r-4726EPSS: top 64%

    Flask session does not add `Vary: Cookie` header when accessed in some ways

    Fixed in 3.1.3. Published Feb 19, 2026.

Is Flask the only one?

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How this page is checked

StackPrism asks OSV.dev which advisories affect exactly Flask 3.0.2, merges duplicates filed under several ids, and ranks them with CISA’s Known Exploited Vulnerabilities list and FIRST EPSS. Release dates and deprecation come from deps.dev and PyPI. No AI writes this page: every sentence comes from that data, refreshed every few hours.

Last checked against PyPI, OSV.dev, deps.dev, CISA KEV and FIRST EPSS.