fix(deps): update dependency urllib3 to <2.6.4,>=2.6.3 [security] (#22)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [urllib3](https://redirect.github.com/urllib3/urllib3)
([changelog](https://redirect.github.com/urllib3/urllib3/blob/main/CHANGES.rst))
| `<2.4.0,>=2.3.0` → `<2.6.4,>=2.6.3` |
![age](https://developer.mend.io/api/mc/badges/age/pypi/urllib3/2.6.3?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/urllib3/2.3.0/2.6.3?slim=true)
|

### GitHub Vulnerability Alerts

####
[CVE-2025-50181](https://redirect.github.com/urllib3/urllib3/security/advisories/GHSA-pq67-6m6q-mj2v)

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:

```python
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:

```python
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](mailto:sethmichaellarson@gmail.com) to
discuss sponsorship or contribution opportunities.
* Disable redirects at the `request()` level instead of the
`PoolManager()` level.

####
[CVE-2025-50182](https://redirect.github.com/urllib3/urllib3/security/advisories/GHSA-48p4-8xcf-vxj5)

urllib3
[supports](https://urllib3.readthedocs.io/en/2.4.0/reference/contrib/emscripten.html)
being used in a Pyodide runtime utilizing the [JavaScript Fetch
API](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API) or
falling back on
[XMLHttpRequest](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest).
This means you can use Python libraries to make HTTP requests from your
browser or Node.js. Additionally, urllib3 provides [a
mechanism](https://urllib3.readthedocs.io/en/2.4.0/user-guide.html#retrying-requests)
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.

####
[CVE-2025-66418](https://redirect.github.com/urllib3/urllib3/security/advisories/GHSA-gm62-xv2j-4w53)

## Impact

urllib3 supports chained HTTP encoding algorithms for response content
according to RFC 9110 (e.g., `Content-Encoding: gzip, zstd`).

However, 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.

## Affected usages

Applications and libraries using urllib3 version 2.5.0 and earlier for
HTTP requests to untrusted sources unless they disable content decoding
explicitly.

## Remediation

Upgrade to at least urllib3 v2.6.0 in which the library limits the
number of links to 5.

If upgrading is not immediately possible, use
[`preload_content=False`](https://urllib3.readthedocs.io/en/2.5.0/advanced-usage.html#streaming-and-i-o)
and ensure that `resp.headers["content-encoding"]` contains a safe
number of encodings before reading the response content.

####
[CVE-2025-66471](https://redirect.github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37)

### Impact

urllib3's [streaming
API](https://urllib3.readthedocs.io/en/2.5.0/advanced-usage.html#streaming-and-i-o)
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; CWE-409) on the client side, even
if the application only requested a small chunk of data.

### Affected usages

Applications and libraries using urllib3 version 2.5.0 and earlier to
stream large compressed responses or content from untrusted sources.

`stream()`, `read(amt=256)`, `read1(amt=256)`, `read_chunked(amt=256)`,
`readinto(b)` are examples of `urllib3.HTTPResponse` method calls using
the affected logic unless decoding is disabled explicitly.

### Remediation

Upgrade to at least urllib3 v2.6.0 in which the library avoids
decompressing data that exceeds the requested amount.

If your environment contains a package facilitating the Brotli encoding,
upgrade to at least Brotli 1.2.0 or brotlicffi 1.2.0.0 too. These
versions are enforced by the `urllib3[brotli]` extra in the patched
versions of urllib3.

### Credits

The issue was reported by @&#8203;Cycloctane.
Supplemental information was provided by @&#8203;stamparm during a
security audit performed by [7ASecurity](https://7asecurity.com/) and
facilitated by [OSTIF](https://ostif.org/).

####
[CVE-2026-21441](https://redirect.github.com/urllib3/urllib3/security/advisories/GHSA-38jv-5279-wg99)

### Impact

urllib3's [streaming
API](https://urllib3.readthedocs.io/en/2.6.2/advanced-usage.html#streaming-and-i-o)
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](https://urllib3.readthedocs.io/en/2.6.2/user-guide.html#retrying-requests)
by setting `redirect=False` for requests to untrusted source.

---

### Release Notes

<details>
<summary>urllib3/urllib3 (urllib3)</summary>

###
[`v2.6.3`](https://redirect.github.com/urllib3/urllib3/blob/HEAD/CHANGES.rst#263-2026-01-07)

[Compare
Source](https://redirect.github.com/urllib3/urllib3/compare/2.6.2...2.6.3)

\==================

- 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`](https://redirect.github.com/urllib3/urllib3/blob/HEAD/CHANGES.rst#262-2025-12-11)

[Compare
Source](https://redirect.github.com/urllib3/urllib3/compare/2.6.1...2.6.2)

\==================

- 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`](https://redirect.github.com/urllib3/urllib3/blob/HEAD/CHANGES.rst#261-2025-12-08)

[Compare
Source](https://redirect.github.com/urllib3/urllib3/compare/2.6.0...2.6.1)

\==================

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

###
[`v2.6.0`](https://redirect.github.com/urllib3/urllib3/blob/HEAD/CHANGES.rst#260-2025-12-05)

[Compare
Source](https://redirect.github.com/urllib3/urllib3/compare/2.5.0...2.6.0)

\==================

## Security

- Fixed a security issue where streaming API could improperly handle
highly
compressed HTTP content ("decompression bombs") leading to excessive
resource
consumption even when a small amount of data was requested. Reading
small
  chunks of compressed data is safer and much more efficient now.
(`GHSA-2xpw-w6gg-jr37
<https://github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37>`\_\_)
- Fixed a security issue where an attacker could compose an HTTP
response with
virtually unlimited links in the `Content-Encoding` header, potentially
leading to a denial of service (DoS) attack by exhausting system
resources
during decoding. The number of allowed chained encodings is now limited
to 5.
(`GHSA-gm62-xv2j-4w53
<https://github.com/urllib3/urllib3/security/advisories/GHSA-gm62-xv2j-4w53>`\_\_)

.. caution::

- If urllib3 is not installed with the optional `urllib3[brotli]` extra,
but
your environment contains a Brotli/brotlicffi/brotlipy package anyway,
make
  sure to upgrade it to at least Brotli 1.2.0 or brotlicffi 1.2.0.0 to
  benefit from the security fixes and avoid warnings. Prefer using
`urllib3[brotli]` to install a compatible Brotli package automatically.

- If you use custom decompressors, please make sure to update them to
  respect the changed API of `urllib3.response.ContentDecoder`.

## Features

- Enabled retrieval, deletion, and membership testing in
`HTTPHeaderDict` using bytes keys. (`#&#8203;3653
<https://github.com/urllib3/urllib3/issues/3653>`\_\_)
- Added host and port information to string representations of
`HTTPConnection`. (`#&#8203;3666
<https://github.com/urllib3/urllib3/issues/3666>`\_\_)
- Added support for Python 3.14 free-threading builds explicitly.
(`#&#8203;3696 <https://github.com/urllib3/urllib3/issues/3696>`\_\_)

## Removals

- Removed the `HTTPResponse.getheaders()` method in favor of
`HTTPResponse.headers`.
Removed the `HTTPResponse.getheader(name, default)` method in favor of
`HTTPResponse.headers.get(name, default)`. (`#&#8203;3622
<https://github.com/urllib3/urllib3/issues/3622>`\_\_)

## Bugfixes

- Fixed redirect handling in `urllib3.PoolManager` when an integer is
passed
for the retries parameter. (`#&#8203;3649
<https://github.com/urllib3/urllib3/issues/3649>`\_\_)
- Fixed `HTTPConnectionPool` when used in Emscripten with no explicit
port. (`#&#8203;3664
<https://github.com/urllib3/urllib3/issues/3664>`\_\_)
- Fixed handling of `SSLKEYLOGFILE` with expandable variables.
(`#&#8203;3700 <https://github.com/urllib3/urllib3/issues/3700>`\_\_)

## Misc

- Changed the `zstd` extra to install `backports.zstd` instead of
`zstandard` on Python 3.13 and before. (`#&#8203;3693
<https://github.com/urllib3/urllib3/issues/3693>`\_\_)
- Improved the performance of content decoding by optimizing
`BytesQueueBuffer` class. (`#&#8203;3710
<https://github.com/urllib3/urllib3/issues/3710>`\_\_)
- Allowed building the urllib3 package with newer setuptools-scm v9.x.
(`#&#8203;3652 <https://github.com/urllib3/urllib3/issues/3652>`\_\_)
- Ensured successful urllib3 builds by setting Hatchling requirement to
>= 1.27.0. (`#&#8203;3638
<https://github.com/urllib3/urllib3/issues/3638>`\_\_)

###
[`v2.5.0`](https://redirect.github.com/urllib3/urllib3/blob/HEAD/CHANGES.rst#250-2025-06-18)

[Compare
Source](https://redirect.github.com/urllib3/urllib3/compare/2.4.0...2.5.0)

\==================

## 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`](https://redirect.github.com/urllib3/urllib3/blob/HEAD/CHANGES.rst#240-2025-04-10)

[Compare
Source](https://redirect.github.com/urllib3/urllib3/compare/2.3.0...2.4.0)

\==================

## 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>`\_\_)

</details>

---

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♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
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🔕 **Ignore**: Close this PR and you won't be reminded about this update
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---

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---

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View the [repository job
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Author: 3 people

.github/workflows/python.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.9", "3.10", "3.11", "3.12", "3.13" ]
+        python-version: [ "3.10", "3.11", "3.12", "3.13" ]
     steps:
     - uses: actions/checkout@v4
     - uses: astral-sh/setup-uv@v5

docs/pyproject.toml

@@ -3,7 +3,7 @@ name = "docs"
 version = "0.1.0"
 description = "Add your description here"
 readme = "README.md"
-requires-python = ">=3.9, <4.0"
+requires-python = ">=3.10, <4.0"
 dependencies = [
     "mkdocs-material>=9.5.18",
     "mkdocs==1.6.1",

pyproject.toml

@@ -7,13 +7,13 @@ authors = [
     {name = "Niklas Rosenstein", email = "rosensteinniklas@gmail.com"},
 ]
 license = {text = "MIT"}
-requires-python = "<4.0,>=3.9"
+requires-python = "<4.0,>=3.10"
 dependencies = [
     "cryptography<44.0.1,>=44.0.0",
     "pygithub>=2.5.0",
     "PyJWT<3.0.0,>=2.6.0",
     "requests<3.0.0,>=2.28.2",
-    "urllib3<2.4.0,>=2.3.0",
+    "urllib3<2.6.4,>=2.6.3",
 ]
 name = "github-bot-api"
 version = "0.7.0"
@@ -23,7 +23,6 @@ classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -37,7 +36,7 @@ Documentation = "https://niklasrosenstein.github.io/python-github-bot-api/"
 Repository = "https://github.com/NiklasRosenstein/python-github-bot-api"
 
 [tool.mypy]
-python_version = "3.9"
+python_version = "3.10"
 explicit_package_bases = true
 mypy_path = ["src"]
 namespace_packages = true