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OpenAdvisories

Package · Ubuntu

flask

3 known vulnerabilities.

All Critical High Medium Low Exploited only Public exploit

3 results · Feed

  • Low 2.3
    CVE-2026-27205

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

    Flask is a web server gateway interface (WSGI) web application framework. In versions 3.1.2 and below, when the session object is accessed, Flask should set the Vary: Cookie header., resulting in a Use of Cache Containing Sensitive Information vulnerability. …

    pallets flask flask flask Debian Ubuntu PyPI
  • High 7.5
    CVE-2023-30861 Public exploit

    Flask vulnerable to possible disclosure of permanent session cookie due to missing Vary: Cookie header

    Flask is a lightweight WSGI web application framework. When all of the following conditions are met, a response containing data intended for one client may be cached and subsequently sent by the proxy to other clients. If the proxy also caches `Set-Cookie` he…

    pallets flask flask flask Debian Ubuntu PyPI
  • High 7.5
    CVE-2018-1000656

    Flask is vulnerable to Denial of Service via incorrect encoding of JSON data

    The 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 service. This attack appear to be exploitable via Attacker provid…

    flask flask flask Debian Ubuntu PyPI