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Update dependency urllib3 to v2.5.0 [SECURITY] by renovate[bot] · Pull Request #282 · DiamondLightSource/python-zocalo

This PR contains the following updates:

Package Change Age Confidence
urllib3 (changelog) ==2.2.3 -> ==2.5.0 age confidence

GitHub Vulnerability Alerts

CVE-2025-50181

urllib3 handles redirects and retries using the same mechanism, which is controlled by the Retry object. The most common way to disable redirects is at the request level, as follows:

resp = urllib3.request("GET", "https://httpbin.org/redirect/1", redirect=False)
print(resp.status)

# 302

However, it is also possible to disable redirects, for all requests, by instantiating a PoolManager and specifying retries in a way that disable redirects:

import urllib3

http = urllib3.PoolManager(retries=0)  # should raise MaxRetryError on redirect
http = urllib3.PoolManager(retries=urllib3.Retry(redirect=0))  # equivalent to the above
http = urllib3.PoolManager(retries=False)  # should return the first response

resp = http.request("GET", "https://httpbin.org/redirect/1")

However, the retries parameter is currently ignored, which means all the above examples don't disable redirects.

Affected usages

Passing retries on PoolManager instantiation to disable redirects or restrict their number.

By default, requests and botocore users are not affected.

Impact

Redirects are often used to exploit SSRF vulnerabilities. An application attempting to mitigate SSRF or open redirect vulnerabilities by disabling redirects at the PoolManager level will remain vulnerable.

Remediation

You can remediate this vulnerability with the following steps:

  • Upgrade to a patched version of urllib3. If your organization would benefit from the continued support of urllib3 1.x, please contact sethmichaellarson@gmail.com to discuss sponsorship or contribution opportunities.
  • Disable redirects at the request() level instead of the PoolManager() level.

CVE-2025-50182

urllib3 supports being used in a Pyodide runtime utilizing the JavaScript Fetch API or falling back on XMLHttpRequest. This means you can use Python libraries to make HTTP requests from your browser or Node.js. Additionally, urllib3 provides a mechanism to control redirects.

However, the retries and redirect parameters are ignored with Pyodide; the runtime itself determines redirect behavior.

Affected usages

Any code which relies on urllib3 to control the number of redirects for an HTTP request in a Pyodide runtime.

Impact

Redirects are often used to exploit SSRF vulnerabilities. An application attempting to mitigate SSRF or open redirect vulnerabilities by disabling redirects may remain vulnerable if a Pyodide runtime redirect mechanism is unsuitable.

Remediation

If you use urllib3 in Node.js, upgrade to a patched version of urllib3.

Unfortunately, browsers provide no suitable way which urllib3 can use: XMLHttpRequest provides no control over redirects, the Fetch API returns opaqueredirect responses lacking data when redirects are controlled manually. Expect default browser behavior for redirects.

Release Notes

urllib3/urllib3 (urllib3)

v2.5.0

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

Features

  • Added support for the compression.zstd module that is new in Python 3.14.
    See PEP 784 <https://peps.python.org/pep-0784/>_ for more information. (#&#8203;3610 <https://github.com/urllib3/urllib3/issues/3610>__)
  • Added support for version 0.5 of hatch-vcs (#&#8203;3612 <https://github.com/urllib3/urllib3/issues/3612>__)

Bugfixes

  • Fixed a security issue where restricting the maximum number of followed
    redirects at the urllib3.PoolManager level via the retries parameter
    did not work.
  • Made the Node.js runtime respect redirect parameters such as retries
    and redirects.
  • Raised exception for HTTPResponse.shutdown on a connection already released to the pool. (#&#8203;3581 <https://github.com/urllib3/urllib3/issues/3581>__)
  • Fixed incorrect CONNECT statement when using an IPv6 proxy with connection_from_host. Previously would not be wrapped in []. (#&#8203;3615 <https://github.com/urllib3/urllib3/issues/3615>__)

v2.4.0

Compare Source

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

Features

  • Applied PEP 639 by specifying the license fields in pyproject.toml. (#&#8203;3522 <https://github.com/urllib3/urllib3/issues/3522>__)
  • Updated exceptions to save and restore more properties during the pickle/serialization process. (#&#8203;3567 <https://github.com/urllib3/urllib3/issues/3567>__)
  • Added verify_flags option to create_urllib3_context with a default of VERIFY_X509_PARTIAL_CHAIN and VERIFY_X509_STRICT for Python 3.13+. (#&#8203;3571 <https://github.com/urllib3/urllib3/issues/3571>__)

Bugfixes

  • Fixed a bug with partial reads of streaming data in Emscripten. (#&#8203;3555 <https://github.com/urllib3/urllib3/issues/3555>__)

Misc

  • Switched to uv for installing development dependecies. (#&#8203;3550 <https://github.com/urllib3/urllib3/issues/3550>__)
  • Removed the multiple.intoto.jsonl asset from GitHub releases. Attestation of release files since v2.3.0 can be found on PyPI. (#&#8203;3566 <https://github.com/urllib3/urllib3/issues/3566>__)

v2.3.0

Compare Source

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

Features

  • Applied PEP 639 by specifying the license fields in pyproject.toml. (#&#8203;3522 <https://github.com/urllib3/urllib3/issues/3522>__)
  • Updated exceptions to save and restore more properties during the pickle/serialization process. (#&#8203;3567 <https://github.com/urllib3/urllib3/issues/3567>__)
  • Added verify_flags option to create_urllib3_context with a default of VERIFY_X509_PARTIAL_CHAIN and VERIFY_X509_STRICT for Python 3.13+. (#&#8203;3571 <https://github.com/urllib3/urllib3/issues/3571>__)

Bugfixes

  • Fixed a bug with partial reads of streaming data in Emscripten. (#&#8203;3555 <https://github.com/urllib3/urllib3/issues/3555>__)

Misc

  • Switched to uv for installing development dependecies. (#&#8203;3550 <https://github.com/urllib3/urllib3/issues/3550>__)
  • Removed the multiple.intoto.jsonl asset from GitHub releases. Attestation of release files since v2.3.0 can be found on PyPI. (#&#8203;3566 <https://github.com/urllib3/urllib3/issues/3566>__)

Configuration

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