Flask-2.2.2-py3-none-any.whl: 2 vulnerabilities (highest severity is: 7.5)

[mend-bolt-for-github]

Vulnerable Library - Flask-2.2.2-py3-none-any.whl

A simple framework for building complex web applications.

Library home page: https://files.pythonhosted.org/packages/0f/43/15f4f9ab225b0b25352412e8daa3d0e3d135fcf5e127070c74c3632c8b4c/Flask-2.2.2-py3-none-any.whl

Path to dependency file: /requirements.txt

Path to vulnerable library: /requirements.txt

Vulnerabilities

Vulnerability	Severity	CVSS	Dependency	Type	Fixed in (Flask version)	Remediation Possible**
CVE-2023-30861	High	7.5	Flask-2.2.2-py3-none-any.whl	Direct	flask - 2.3.2,flask - 2.2.5,flask - 2.3.2,flask - 2.2.5	❌
CVE-2026-27205	Medium	4.3	Flask-2.2.2-py3-none-any.whl	Direct	https://github.com/pallets/flask.git - 3.1.3	❌

**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation

Details

CVE-2023-30861

Vulnerable Library - Flask-2.2.2-py3-none-any.whl

A simple framework for building complex web applications.

Library home page: https://files.pythonhosted.org/packages/0f/43/15f4f9ab225b0b25352412e8daa3d0e3d135fcf5e127070c74c3632c8b4c/Flask-2.2.2-py3-none-any.whl

Path to dependency file: /requirements.txt

Path to vulnerable library: /requirements.txt

Dependency Hierarchy:

• ❌ Flask-2.2.2-py3-none-any.whl (Vulnerable Library)

Found in base branch: main

Vulnerability Details

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" headers, it may send one client's "session" cookie to other clients. The severity depends on the application's use of the session and the proxy's behavior regarding cookies. The risk depends on all these conditions being met.

1. The application must be hosted behind a caching proxy that does not strip cookies or ignore responses with cookies.
2. The application sets "session.permanent = True"
3. The application does not access or modify the session at any point during a request.
4. "SESSION_REFRESH_EACH_REQUEST" enabled (the default).
5. The application does not set a "Cache-Control" header to indicate that a page is private or should not be cached.
   This happens because vulnerable versions of Flask only set the "Vary: Cookie" header when the session is accessed or modified, not when it is refreshed (re-sent to update the expiration) without being accessed or modified. This issue has been fixed in versions 2.3.2 and 2.2.5.
   Mend Note: The description of this vulnerability differs from MITRE.

Publish Date: 2023-05-02

URL: CVE-2023-30861

CVSS 3 Score Details (7.5)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: High
  • Integrity Impact: None
  • Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-m2qf-hxjv-5gpq

Release Date: 2023-05-02

Fix Resolution: flask - 2.3.2,flask - 2.2.5,flask - 2.3.2,flask - 2.2.5

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CVE-2026-27205

Vulnerable Library - Flask-2.2.2-py3-none-any.whl

A simple framework for building complex web applications.

Library home page: https://files.pythonhosted.org/packages/0f/43/15f4f9ab225b0b25352412e8daa3d0e3d135fcf5e127070c74c3632c8b4c/Flask-2.2.2-py3-none-any.whl

Path to dependency file: /requirements.txt

Path to vulnerable library: /requirements.txt

Dependency Hierarchy:

• ❌ Flask-2.2.2-py3-none-any.whl (Vulnerable Library)

Found in base branch: main

Vulnerability Details

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. The logic instructs caches not to cache the response, as it may contain information specific to a logged in user. This is handled in most cases, but some forms of access such as the Python in operator were overlooked. The severity and risk depend on the application being hosted behind a caching proxy that doesn't ignore responses with cookies, not setting a Cache-Control header to mark pages as private or non-cacheable, and accessing the session in a way that only touches keys without reading values or mutating the session. The issue has been fixed in version 3.1.3.

Publish Date: 2026-02-21

URL: CVE-2026-27205

CVSS 3 Score Details (4.3)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: Low
  • Integrity Impact: None
  • Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Release Date: 2026-02-21

Fix Resolution: https://github.com/pallets/flask.git - 3.1.3

Step up your Open Source Security Game with Mend here

[secure-code-warrior-for-github]

Micro-Learning Topic: Vulnerable library (Detected by phrase)

Matched on "Vulnerable Library"

What is this? (2min video)

Use of vulnerable components will introduce weaknesses into the application. Components with published vulnerabilities will allow easy exploitation as resources will often be available to automate the process.

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