chore(deps): update dependency urllib3 to v2.6.3 [security]

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
urllib3 (changelog)	==2.6.0 → ==2.6.3

GitHub Vulnerability Alerts

CVE-2026-21441

Impact

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.

urllib3 can perform decoding or decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd). When using the streaming API, the library decompresses only the necessary bytes, enabling partial content consumption.

However, for HTTP redirect responses, the library would read the entire response body to drain the connection and decompress the content unnecessarily. This decompression occurred even before any read methods were called, and configured read limits did not restrict the amount of decompressed data. As a result, there was no safeguard against decompression bombs. A malicious server could exploit this to trigger excessive resource consumption on the client (high CPU usage and large memory allocations for decompressed data; CWE-409).

Affected usages

Applications and libraries using urllib3 version 2.6.2 and earlier to stream content from untrusted sources by setting preload_content=False when they do not disable redirects.

Remediation

Upgrade to at least urllib3 v2.6.3 in which the library does not decode content of redirect responses when preload_content=False.

If upgrading is not immediately possible, disable redirects by setting redirect=False for requests to untrusted source.

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Release Notes

urllib3/urllib3 (urllib3)

v2.6.3

Compare Source

==================

• Fixed a high-severity security issue where decompression-bomb safeguards of
  the streaming API were bypassed when HTTP redirects were followed.
  (GHSA-38jv-5279-wg99 <https://github.com/urllib3/urllib3/security/advisories/GHSA-38jv-5279-wg99>__)
• Started treating Retry-After times greater than 6 hours as 6 hours by
  default. (#&#8203;3743 <https://github.com/urllib3/urllib3/issues/3743>__)
• Fixed urllib3.connection.VerifiedHTTPSConnection on Emscripten.
  (#&#8203;3752 <https://github.com/urllib3/urllib3/issues/3752>__)

v2.6.2

Compare Source

==================

• Fixed HTTPResponse.read_chunked() to properly handle leftover data in
  the decoder's buffer when reading compressed chunked responses.
  (#&#8203;3734 <https://github.com/urllib3/urllib3/issues/3734>__)

v2.6.1

Compare Source

==================

• Restore previously removed HTTPResponse.getheaders() and
  HTTPResponse.getheader() methods.
  (#&#8203;3731 <https://github.com/urllib3/urllib3/issues/3731>__)

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[gemini-code-assist]

Summary of Changes

Hello @renovate-bot, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on a critical security update for the urllib3 library. By upgrading to the latest patch version, the project mitigates a vulnerability related to decompression bombs during HTTP redirects, enhancing the application's resilience against malicious server responses and ensuring more secure handling of streamed content.

Highlights

• Dependency Update: The urllib3 dependency has been updated from version 2.6.0 to 2.6.3.
• Security Fix (CVE-2026-21441): This update addresses a high-severity security vulnerability where urllib3's streaming API could be susceptible to decompression bombs when following HTTP redirects. The fix ensures that content of redirect responses is no longer decoded when preload_content=False, preventing excessive resource consumption.
• Improved Retry-After Handling: The update also includes a change to treat Retry-After times greater than 6 hours as 6 hours by default.

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[gemini-code-assist]

Code Review

This pull request updates the urllib3 dependency from version 2.6.0 to 2.6.3 in samples/snippets/requirements.txt. This is a crucial update as it addresses a high-severity security vulnerability (CVE-2026-21441) related to decompression bombs in urllib3's streaming API when handling HTTP redirect responses. The update ensures that the library no longer decodes content of redirect responses when preload_content=False, thereby mitigating the risk of excessive resource consumption. The change is straightforward and directly resolves the identified security concern.