urllib3-2.0.7-py3-none-any.whl: 4 vulnerabilities (highest severity is: 7.5)

[mend-bolt-for-github]

Vulnerable Library - urllib3-2.0.7-py3-none-any.whl

HTTP library with thread-safe connection pooling, file post, and more.

Library home page: https://files.pythonhosted.org/packages/d2/b2/b157855192a68541a91ba7b2bbcb91f1b4faa51f8bae38d8005c034be524/urllib3-2.0.7-py3-none-any.whl

Path to dependency file: /requirements.txt

Path to vulnerable library: /requirements.txt

Found in HEAD commit: 6500b2f18ad98b4ffb3cb2150216bcab7139ccdb

Vulnerabilities

Vulnerability	Severity	CVSS	Dependency	Type	Fixed in (urllib3 version)	Remediation Possible**
CVE-2025-66471	High	7.5	urllib3-2.0.7-py3-none-any.whl	Direct	urllib3 - 2.6.0,https://github.com/urllib3/urllib3.git - 2.6.0	❌
CVE-2025-66418	High	7.5	urllib3-2.0.7-py3-none-any.whl	Direct	https://github.com/urllib3/urllib3.git - 2.6.0,urllib3 - 2.6.0	❌
CVE-2025-50181	Medium	5.3	urllib3-2.0.7-py3-none-any.whl	Direct	2.5.0	❌
CVE-2024-37891	Medium	4.4	urllib3-2.0.7-py3-none-any.whl	Direct	2.2.2	❌

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

Details

CVE-2025-66471

Vulnerable Library - urllib3-2.0.7-py3-none-any.whl

HTTP library with thread-safe connection pooling, file post, and more.

Library home page: https://files.pythonhosted.org/packages/d2/b2/b157855192a68541a91ba7b2bbcb91f1b4faa51f8bae38d8005c034be524/urllib3-2.0.7-py3-none-any.whl

Path to dependency file: /requirements.txt

Path to vulnerable library: /requirements.txt

Dependency Hierarchy:

• ❌ urllib3-2.0.7-py3-none-any.whl (Vulnerable Library)

Found in HEAD commit: 6500b2f18ad98b4ffb3cb2150216bcab7139ccdb

Found in base branch: main

Vulnerability Details

urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.0 and prior to 2.6.0, the Streaming API improperly handles highly compressed data. urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. When streaming a compressed response, urllib3 can perform decoding or decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd). The library must read compressed data from the network and decompress it until the requested chunk size is met. Any resulting decompressed data that exceeds the requested amount is held in an internal buffer for the next read operation. The decompression logic could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This can result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data.

Publish Date: 2025-12-05

URL: CVE-2025-66471

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: None
  • Integrity Impact: None
  • Availability Impact: High

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-2xpw-w6gg-jr37

Release Date: 2025-12-05

Fix Resolution: urllib3 - 2.6.0,https://github.com/urllib3/urllib3.git - 2.6.0

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CVE-2025-66418

Vulnerable Library - urllib3-2.0.7-py3-none-any.whl

HTTP library with thread-safe connection pooling, file post, and more.

Library home page: https://files.pythonhosted.org/packages/d2/b2/b157855192a68541a91ba7b2bbcb91f1b4faa51f8bae38d8005c034be524/urllib3-2.0.7-py3-none-any.whl

Path to dependency file: /requirements.txt

Path to vulnerable library: /requirements.txt

Dependency Hierarchy:

• ❌ urllib3-2.0.7-py3-none-any.whl (Vulnerable Library)

Found in HEAD commit: 6500b2f18ad98b4ffb3cb2150216bcab7139ccdb

Found in base branch: main

Vulnerability Details

urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.24 and prior to 2.6.0, the number of links in the decompression chain was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps leading to high CPU usage and massive memory allocation for the decompressed data. This vulnerability is fixed in 2.6.0.

Publish Date: 2025-12-05

URL: CVE-2025-66418

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: None
  • Integrity Impact: None
  • Availability Impact: High

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Release Date: 2025-12-05

Fix Resolution: https://github.com/urllib3/urllib3.git - 2.6.0,urllib3 - 2.6.0

Step up your Open Source Security Game with Mend here

CVE-2025-50181

Vulnerable Library - urllib3-2.0.7-py3-none-any.whl

HTTP library with thread-safe connection pooling, file post, and more.

Library home page: https://files.pythonhosted.org/packages/d2/b2/b157855192a68541a91ba7b2bbcb91f1b4faa51f8bae38d8005c034be524/urllib3-2.0.7-py3-none-any.whl

Path to dependency file: /requirements.txt

Path to vulnerable library: /requirements.txt

Dependency Hierarchy:

• ❌ urllib3-2.0.7-py3-none-any.whl (Vulnerable Library)

Found in HEAD commit: 6500b2f18ad98b4ffb3cb2150216bcab7139ccdb

Found in base branch: main

Vulnerability Details

urllib3 is a user-friendly HTTP client library for Python. Prior to 2.5.0, it is possible to disable redirects for all requests by instantiating a PoolManager and specifying retries in a way that disable redirects. By default, requests and botocore users are not affected. An application attempting to mitigate SSRF or open redirect vulnerabilities by disabling redirects at the PoolManager level will remain vulnerable. This issue has been patched in version 2.5.0.

Publish Date: 2025-06-19

URL: CVE-2025-50181

CVSS 3 Score Details (5.3)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: High
  • Privileges Required: Low
  • 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

Release Date: 2025-06-19

Fix Resolution: 2.5.0

Step up your Open Source Security Game with Mend here

CVE-2024-37891

Vulnerable Library - urllib3-2.0.7-py3-none-any.whl

HTTP library with thread-safe connection pooling, file post, and more.

Library home page: https://files.pythonhosted.org/packages/d2/b2/b157855192a68541a91ba7b2bbcb91f1b4faa51f8bae38d8005c034be524/urllib3-2.0.7-py3-none-any.whl

Path to dependency file: /requirements.txt

Path to vulnerable library: /requirements.txt

Dependency Hierarchy:

• ❌ urllib3-2.0.7-py3-none-any.whl (Vulnerable Library)

Found in HEAD commit: 6500b2f18ad98b4ffb3cb2150216bcab7139ccdb

Found in base branch: main

Vulnerability Details

urllib3 is a user-friendly HTTP client library for Python. When using urllib3's proxy support with "ProxyManager", the "Proxy-Authorization" header is only sent to the configured proxy, as expected. However, when sending HTTP requests without using urllib3's proxy support, it's possible to accidentally configure the "Proxy-Authorization" header even though it won't have any effect as the request is not using a forwarding proxy or a tunneling proxy. In those cases, urllib3 doesn't treat the "Proxy-Authorization" HTTP header as one carrying authentication material and thus doesn't strip the header on cross-origin redirects. Because this is a highly unlikely scenario, we believe the severity of this vulnerability is low for almost all users. Out of an abundance of caution urllib3 will automatically strip the "Proxy-Authorization" header during cross-origin redirects to avoid the small chance that users are doing this on accident. Users should use urllib3's proxy support or disable automatic redirects to achieve safe processing of the "Proxy-Authorization" header, but we still decided to strip the header by default in order to further protect users who aren't using the correct approach. We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited: 1. Setting the "Proxy-Authorization" header without using urllib3's built-in proxy support. 2. Not disabling HTTP redirects. 3. Either not using an HTTPS origin server or for the proxy or target origin to redirect to a malicious origin. Users are advised to update to either version 1.26.19 or version 2.2.2. Users unable to upgrade may use the "Proxy-Authorization" header with urllib3's "ProxyManager", disable HTTP redirects using "redirects=False" when sending requests, or not user the "Proxy-Authorization" header as mitigations.
Mend Note: The description of this vulnerability differs from MITRE.

Publish Date: 2024-06-17

URL: CVE-2024-37891

CVSS 3 Score Details (4.4)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: High
  • Privileges Required: High
  • 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-34jh-p97f-mpxf

Release Date: 2024-06-17

Fix Resolution: 2.2.2

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