Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.19 to
2.6.3.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/urllib3/urllib3/releases">urllib3's">https://github.com/urllib3/urllib3/releases">urllib3's
releases</a>.</em></p>
<blockquote>
<h2>2.6.3</h2>
<h2>🚀 urllib3 is fundraising for HTTP/2 support</h2>
<p><a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://sethmlarson.dev/urllib3-is-fundraising-for-http2-support">urllib3" rel="nofollow">https://sethmlarson.dev/urllib3-is-fundraising-for-http2-support">urllib3
is raising ~$40,000 USD</a> to release HTTP/2 support and ensure
long-term sustainable maintenance of the project after a sharp decline
in financial support. If your company or organization uses Python and
would benefit from HTTP/2 support in Requests, pip, cloud SDKs, and
thousands of other projects <a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://opencollective.com/urllib3">please" rel="nofollow">https://opencollective.com/urllib3">please consider contributing
financially</a> to ensure HTTP/2 support is developed sustainably and
maintained for the long-haul.</p>
<p>Thank you for your support.</p>
<h2>Changes</h2>
<ul>
<li>Fixed a security issue where decompression-bomb safeguards of the
streaming API were bypassed when HTTP redirects were followed.
(CVE-2026-21441 reported by <a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/D47A"><code>@​D47A</code></a">https://github.com/D47A"><code>@​D47A</code></a>, 8.9 High,
GHSA-38jv-5279-wg99)</li>
<li>Started treating <code>Retry-After</code> times greater than 6 hours
as 6 hours by default. (<a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://redirect.github.com/urllib3/urllib3/issues/3743">urllib3/urllib3#3743</a>)</li">https://redirect.github.com/urllib3/urllib3/issues/3743">urllib3/urllib3#3743</a>)</li>
<li>Fixed <code>urllib3.connection.VerifiedHTTPSConnection</code> on
Emscripten. (<a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://redirect.github.com/urllib3/urllib3/issues/3752">urllib3/urllib3#3752</a>)</li">https://redirect.github.com/urllib3/urllib3/issues/3752">urllib3/urllib3#3752</a>)</li>
</ul>
<h2>2.6.2</h2>
<h2>🚀 urllib3 is fundraising for HTTP/2 support</h2>
<p><a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://sethmlarson.dev/urllib3-is-fundraising-for-http2-support">urllib3" rel="nofollow">https://sethmlarson.dev/urllib3-is-fundraising-for-http2-support">urllib3
is raising ~$40,000 USD</a> to release HTTP/2 support and ensure
long-term sustainable maintenance of the project after a sharp decline
in financial support. If your company or organization uses Python and
would benefit from HTTP/2 support in Requests, pip, cloud SDKs, and
thousands of other projects <a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://opencollective.com/urllib3">please" rel="nofollow">https://opencollective.com/urllib3">please consider contributing
financially</a> to ensure HTTP/2 support is developed sustainably and
maintained for the long-haul.</p>
<p>Thank you for your support.</p>
<h2>Changes</h2>
<ul>
<li>Fixed <code>HTTPResponse.read_chunked()</code> to properly handle
leftover data in the decoder's buffer when reading compressed chunked
responses. (<a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://redirect.github.com/urllib3/urllib3/issues/3734">urllib3/urllib3#3734</a>)</li">https://redirect.github.com/urllib3/urllib3/issues/3734">urllib3/urllib3#3734</a>)</li>
</ul>
<h2>2.6.1</h2>
<h2>🚀 urllib3 is fundraising for HTTP/2 support</h2>
<p><a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://sethmlarson.dev/urllib3-is-fundraising-for-http2-support">urllib3" rel="nofollow">https://sethmlarson.dev/urllib3-is-fundraising-for-http2-support">urllib3
is raising ~$40,000 USD</a> to release HTTP/2 support and ensure
long-term sustainable maintenance of the project after a sharp decline
in financial support. If your company or organization uses Python and
would benefit from HTTP/2 support in Requests, pip, cloud SDKs, and
thousands of other projects <a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://opencollective.com/urllib3">please" rel="nofollow">https://opencollective.com/urllib3">please consider contributing
financially</a> to ensure HTTP/2 support is developed sustainably and
maintained for the long-haul.</p>
<p>Thank you for your support.</p>
<h2>Changes</h2>
<ul>
<li>Restore previously removed <code>HTTPResponse.getheaders()</code>
and <code>HTTPResponse.getheader()</code> methods. (<a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://redirect.github.com/urllib3/urllib3/issues/3731">#3731</a>)</li">https://redirect.github.com/urllib3/urllib3/issues/3731">#3731</a>)</li>
</ul>
<h2>2.6.0</h2>
<h2>🚀 urllib3 is fundraising for HTTP/2 support</h2>
<p><a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://sethmlarson.dev/urllib3-is-fundraising-for-http2-support">urllib3" rel="nofollow">https://sethmlarson.dev/urllib3-is-fundraising-for-http2-support">urllib3
is raising ~$40,000 USD</a> to release HTTP/2 support and ensure
long-term sustainable maintenance of the project after a sharp decline
in financial support. If your company or organization uses Python and
would benefit from HTTP/2 support in Requests, pip, cloud SDKs, and
thousands of other projects <a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://opencollective.com/urllib3">please" rel="nofollow">https://opencollective.com/urllib3">please consider contributing
financially</a> to ensure HTTP/2 support is developed sustainably and
maintained for the long-haul.</p>
<p>Thank you for your support.</p>
<h2>Security</h2>
<ul>
<li>Fixed a security issue where streaming API could improperly handle
highly compressed HTTP content (&quot;decompression bombs&quot;) 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. (CVE-2025-66471 reported by <a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/Cycloctane"><code>@​Cycloctane</code></a">https://github.com/Cycloctane"><code>@​Cycloctane</code></a>, 8.9
High, GHSA-2xpw-w6gg-jr37)</li>
<li>Fixed a security issue where an attacker could compose an HTTP
response with virtually unlimited links in the
<code>Content-Encoding</code> 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. (CVE-2025-66418
reported by <a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/illia-v"><code>@​illia-v</code></a">https://github.com/illia-v"><code>@​illia-v</code></a>, 8.9 High,
GHSA-gm62-xv2j-4w53)</li>
</ul>
<blockquote>
<p>[!IMPORTANT]</p>
<ul>
<li>If urllib3 is not installed with the optional
<code>urllib3[brotli]</code> 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 <code>urllib3[brotli]</code> to
install a compatible Brotli package automatically.</li>
</ul>
</blockquote>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/urllib3/urllib3/blob/main/CHANGES.rst">urllib3's">https://github.com/urllib3/urllib3/blob/main/CHANGES.rst">urllib3's
changelog</a>.</em></p>
<blockquote>
<h1>2.6.3 (2026-01-07)</h1>
<ul>
<li>Fixed a high-severity security issue where decompression-bomb
safeguards of
the streaming API were bypassed when HTTP redirects were followed.
(<code>GHSA-38jv-5279-wg99
&lt;https://github.com/urllib3/urllib3/security/advisories/GHSA-38jv-5279-wg99&gt;</code>__)</li>
<li>Started treating <code>Retry-After</code> times greater than 6 hours
as 6 hours by
default. (<code>[#3743](urllib3/urllib3#3743)
&lt;https://github.com/urllib3/urllib3/issues/3743&gt;</code>__)</li>
<li>Fixed <code>urllib3.connection.VerifiedHTTPSConnection</code> on
Emscripten.
(<code>[#3752](urllib3/urllib3#3752)
&lt;https://github.com/urllib3/urllib3/issues/3752&gt;</code>__)</li>
</ul>
<h1>2.6.2 (2025-12-11)</h1>
<ul>
<li>Fixed <code>HTTPResponse.read_chunked()</code> to properly handle
leftover data in
the decoder's buffer when reading compressed chunked responses.
(<code>[#3734](urllib3/urllib3#3734)
&lt;https://github.com/urllib3/urllib3/issues/3734&gt;</code>__)</li>
</ul>
<h1>2.6.1 (2025-12-08)</h1>
<ul>
<li>Restore previously removed <code>HTTPResponse.getheaders()</code>
and
<code>HTTPResponse.getheader()</code> methods.
(<code>[#3731](urllib3/urllib3#3731)
&lt;https://github.com/urllib3/urllib3/issues/3731&gt;</code>__)</li>
</ul>
<h1>2.6.0 (2025-12-05)</h1>
<h2>Security</h2>
<ul>
<li>Fixed a security issue where streaming API could improperly handle
highly
compressed HTTP content (&quot;decompression bombs&quot;) 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.
(<code>GHSA-2xpw-w6gg-jr37
&lt;https://github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37&gt;</code>__)</li>
<li>Fixed a security issue where an attacker could compose an HTTP
response with
virtually unlimited links in the <code>Content-Encoding</code> 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.
(<code>GHSA-gm62-xv2j-4w53
&lt;https://github.com/urllib3/urllib3/security/advisories/GHSA-gm62-xv2j-4w53&gt;</code>__)</li>
</ul>
<p>.. caution::</p>
<ul>
<li>If urllib3 is not installed with the optional
<code>urllib3[brotli]</code> 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</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/urllib3/urllib3/commit/0248277dd7ac0239204889ca991353ad3e3a1ddc"><code>0248277</code></a">https://github.com/urllib3/urllib3/commit/0248277dd7ac0239204889ca991353ad3e3a1ddc"><code>0248277</code></a>
Release 2.6.3</li>
<li><a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/urllib3/urllib3/commit/8864ac407bba8607950025e0979c4c69bc7abc7b"><code>8864ac4</code></a">https://github.com/urllib3/urllib3/commit/8864ac407bba8607950025e0979c4c69bc7abc7b"><code>8864ac4</code></a>
Merge commit from fork</li>
<li><a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/urllib3/urllib3/commit/70cecb27ca99d56aaaeb63ac27ee270ef2b24c5c"><code>70cecb2</code></a">https://github.com/urllib3/urllib3/commit/70cecb27ca99d56aaaeb63ac27ee270ef2b24c5c"><code>70cecb2</code></a>
Fix Scorecard issues related to vulnerable dev dependencies (<a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://redirect.github.com/urllib3/urllib3/issues/3755">#3755</a>)</li">https://redirect.github.com/urllib3/urllib3/issues/3755">#3755</a>)</li>
<li><a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/urllib3/urllib3/commit/41f249abe1ef3e20768588969c4035aba060a359"><code>41f249a</code></a">https://github.com/urllib3/urllib3/commit/41f249abe1ef3e20768588969c4035aba060a359"><code>41f249a</code></a>
Move &quot;v2.0 Migration Guide&quot; to the end of the table of
contents (<a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://redirect.github.com/urllib3/urllib3/issues/3747">#3747</a>)</li">https://redirect.github.com/urllib3/urllib3/issues/3747">#3747</a>)</li>
<li><a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/urllib3/urllib3/commit/fd4dffd2fc544166b76151a2fa3d7b7c0eab540c"><code>fd4dffd</code></a">https://github.com/urllib3/urllib3/commit/fd4dffd2fc544166b76151a2fa3d7b7c0eab540c"><code>fd4dffd</code></a>
Patch <code>VerifiedHTTPSConnection</code> for Emscripten (<a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://redirect.github.com/urllib3/urllib3/issues/3752">#3752</a>)</li">https://redirect.github.com/urllib3/urllib3/issues/3752">#3752</a>)</li>
<li><a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/urllib3/urllib3/commit/13f0bfd55e4468fe1ea9c6f809d3a87b0f93ebab"><code>13f0bfd</code></a">https://github.com/urllib3/urllib3/commit/13f0bfd55e4468fe1ea9c6f809d3a87b0f93ebab"><code>13f0bfd</code></a>
Handle massive values in Retry-After when calculating time to sleep for
(<a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://redirect.github.com/urllib3/urllib3/issues/3743">#3743</a>)</li">https://redirect.github.com/urllib3/urllib3/issues/3743">#3743</a>)</li>
<li><a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/urllib3/urllib3/commit/8c480bf87bcefd321b3a1ae47f04e908b6b2ed7b"><code>8c480bf</code></a">https://github.com/urllib3/urllib3/commit/8c480bf87bcefd321b3a1ae47f04e908b6b2ed7b"><code>8c480bf</code></a>
Bump actions/upload-artifact from 5.0.0 to 6.0.0 (<a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://redirect.github.com/urllib3/urllib3/issues/3748">#3748</a>)</li">https://redirect.github.com/urllib3/urllib3/issues/3748">#3748</a>)</li>
<li><a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/urllib3/urllib3/commit/4b40616e959c0a2c466e8075f2a785a9f99bb0c1"><code>4b40616</code></a">https://github.com/urllib3/urllib3/commit/4b40616e959c0a2c466e8075f2a785a9f99bb0c1"><code>4b40616</code></a>
Bump actions/cache from 4.3.0 to 5.0.1 (<a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://redirect.github.com/urllib3/urllib3/issues/3750">#3750</a>)</li">https://redirect.github.com/urllib3/urllib3/issues/3750">#3750</a>)</li>
<li><a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/urllib3/urllib3/commit/82b8479663d037d220c883f1584dd01a43bb273b"><code>82b8479</code></a">https://github.com/urllib3/urllib3/commit/82b8479663d037d220c883f1584dd01a43bb273b"><code>82b8479</code></a>
Bump actions/download-artifact from 6.0.0 to 7.0.0 (<a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://redirect.github.com/urllib3/urllib3/issues/3749">#3749</a>)</li">https://redirect.github.com/urllib3/urllib3/issues/3749">#3749</a>)</li>
<li><a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/urllib3/urllib3/commit/34284cb01700bb7d4fdd472f909e22393e9174e2"><code>34284cb</code></a">https://github.com/urllib3/urllib3/commit/34284cb01700bb7d4fdd472f909e22393e9174e2"><code>34284cb</code></a>
Mention experimental features in the security policy (<a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://redirect.github.com/urllib3/urllib3/issues/3746">#3746</a>)</li">https://redirect.github.com/urllib3/urllib3/issues/3746">#3746</a>)</li>
<li>Additional commits viewable in <a
href="proxy.php?url=https%3A%2F%2Fgithub.com%2F%3Ca+href%3D"https://github.com/urllib3/urllib3/compare/1.26.19...2.6.3">compare">https://github.com/urllib3/urllib3/compare/1.26.19...2.6.3">compare
view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=urllib3&package-manager=pip&previous-version=1.26.19&new-version=2.6.3)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't
alter it yourself. You can also trigger a rebase manually by commenting
`@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits
that have been made to it
- `@dependabot show <dependency name> ignore conditions` will show all
of the ignore conditions of the specified dependency
- `@dependabot ignore this major version` will close this PR and stop
Dependabot creating any more for this major version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop
Dependabot creating any more for this minor version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop
Dependabot creating any more for this dependency (unless you reopen the
PR or upgrade to it yourself)
You can disable automated security fix PRs for this repo from the
[Security Alerts
page](https://github.com/googleapis/sphinx-docfx-yaml/network/alerts).

</details>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>