Python

Flask

Latest secure version 3.1.3

A simple framework for building complex web applications.

BSD-3-Clause

All Versions

Vulnerabilities (Public)

Known vulnerabilities and security issues detected in the extension's dependencies and code.

Vulnerability IDAdvisoryAffected Versions
CVE-2023-30861Flask 2.2.5 and 2.3.2 include a fix for CVE-2023-30861: When all of the following conditions are met, a response containing data intended for one client may be cached and subsequently sent by the prox…
High
<2.2.5
>=2.3.0,<2.3.2
CVE-2019-1010083Flask 0.12.3 includes a fix for CVE-2019-1010083: Unexpected memory usage. The impact is denial of service. The attack vector is crafted encoded JSON data. NOTE: this may overlap CVE-2018-1000656. ht…
High
<0.12.3
CVE-2018-1000656flask 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 service. This attack appea…
High
<0.12.3
CVE-2026-27205Affected versions of the Flask package are vulnerable to Information Disclosure due to missing cache-variation headers when the session object is accessed via certain code paths. In Flask’s session ha…
Low
<3.1.3
CVE-2025-47278Affected versions of Flask (≤ 3.1.0) are vulnerable to incorrect fallback key configuration in session signing, leading to stale key usage instead of the intended current key. This flaw undermines ses…
Low
>=3.1.0,<3.1.1

Safety Discovered Vulnerabilities

Additional security issues found by Safety, exclusive to our platform.

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Vulnerable Functions

Functions linked to known vulnerabilities in this package.

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