chore: bump undici from 6.26.0 to 6.27.0 in the npm_and_yarn group across 1 directory (#908)

Bumps the npm_and_yarn group with 1 update in the / directory:
[undici](https://github.com/nodejs/undici).

Updates `undici` from 6.26.0 to 6.27.0
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/nodejs/undici/releases">undici's
releases</a>.</em></p>
<blockquote>
<h2>v6.27.0</h2>
<h1>⚠️ Security Release</h1>
<p>This release line addresses <strong>4 security
advisories</strong>.</p>
<blockquote>
<p><strong>Action required:</strong> Upgrade to <strong>undici
6.27.0</strong> or later.</p>
<pre lang="sh"><code>npm install undici@^6.27.0
</code></pre>
</blockquote>
<blockquote>
<p><strong>Note on patched version:</strong> the v6 fixes shipped in
<strong>v6.27.0</strong>, not <code>6.26.0</code>
— <code>v6.26.0</code> contains only the chunked-EOF fix (<a
href="https://redirect.github.com/nodejs/undici/issues/5308">#5308</a>)
and the version bump, none
of the security fixes below.</p>
</blockquote>
<p>The v6 line is <strong>not</strong> affected by the SOCKS5 advisories
(GHSA-vmh5-mc38-953g,
GHSA-hm92-r4w5-c3mj), the shared-cache disclosure (GHSA-pr7r-676h-xcf6),
or the
8.x-only WebSocket regression (GHSA-38rv-x7px-6hhq).</p>
<h2>Summary</h2>
<table>
<thead>
<tr>
<th>Advisory</th>
<th>CVE</th>
<th>Severity (CVSS)</th>
<th>Fixed in</th>
<th>Fix commit</th>
</tr>
</thead>
<tbody>
<tr>
<td><a
href="https://github.com/nodejs/undici/security/advisories/GHSA-vxpw-j846-p89q">GHSA-vxpw-j846-p89q</a></td>
<td>CVE-2026-12151</td>
<td>High (7.5)</td>
<td>6.27.0</td>
<td><a
href="https://github.com/nodejs/undici/commit/b7f252e7"><code>b7f252e7</code></a></td>
</tr>
<tr>
<td><a
href="https://github.com/nodejs/undici/security/advisories/GHSA-p88m-4jfj-68fv">GHSA-p88m-4jfj-68fv</a></td>
<td>CVE-2026-9679</td>
<td>Moderate (5.9)</td>
<td>6.27.0</td>
<td><a
href="https://github.com/nodejs/undici/commit/25efa447"><code>25efa447</code></a></td>
</tr>
<tr>
<td><a
href="https://github.com/nodejs/undici/security/advisories/GHSA-g8m3-5g58-fq7m">GHSA-g8m3-5g58-fq7m</a></td>
<td>CVE-2026-11525</td>
<td>Low (3.7)</td>
<td>6.27.0</td>
<td><a
href="https://github.com/nodejs/undici/commit/25efa447"><code>25efa447</code></a></td>
</tr>
<tr>
<td><a
href="https://github.com/nodejs/undici/security/advisories/GHSA-35p6-xmwp-9g52">GHSA-35p6-xmwp-9g52</a></td>
<td>CVE-2026-6733</td>
<td>Low (3.7)</td>
<td>6.27.0</td>
<td><a
href="https://github.com/nodejs/undici/commit/f4c31d60"><code>f4c31d60</code></a></td>
</tr>
</tbody>
</table>
<hr />
<h2>High severity</h2>
<h3>WebSocket DoS via fragment count bypass — CVE-2026-12151</h3>
<p><strong><a
href="https://github.com/nodejs/undici/security/advisories/GHSA-vxpw-j846-p89q">GHSA-vxpw-j846-p89q</a></strong>
· CWE-400, CWE-770
<strong>Fix:</strong> <a
href="https://github.com/nodejs/undici/commit/b7f252e7"><code>b7f252e7</code></a>
<em>Backport WebSocket maxPayloadSize fixes</em> (<a
href="https://redirect.github.com/nodejs/undici/pull/5423">#5423</a>,
backported to v6 in <a
href="https://redirect.github.com/nodejs/undici/pull/5428">#5428</a>)</p>
<p>A malicious WebSocket server can stream a large number of small or
empty
continuation frames. Undici enforced a limit on cumulative payload size
but did
not limit the <em>number</em> of fragments per message, leading to
unbounded memory
growth and denial of service. All releases from 6.17.0 onward are
affected.</p>
<ul>
<li><strong>Affected:</strong> applications using <code>new
WebSocket(...)</code> or <code>WebSocketStream</code>
against untrusted endpoints.</li>
<li><strong>Workaround:</strong> none — upgrade is required.</li>
</ul>
<hr />
<h2>Moderate severity</h2>
<h3>HTTP header injection via Set-Cookie percent-decoding —
CVE-2026-9679</h3>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/nodejs/undici/commit/551138cbc1742c92242a68216167761075e8a82c"><code>551138c</code></a>
Bumped v6.27.0 (<a
href="https://redirect.github.com/nodejs/undici/issues/5431">#5431</a>)</li>
<li><a
href="https://github.com/nodejs/undici/commit/b7f252e7c0841418fb9d95cd297bdd9fad9d2a53"><code>b7f252e</code></a>
Backport WebSocket maxPayloadSize fixes to v7.x (<a
href="https://redirect.github.com/nodejs/undici/issues/5423">#5423</a>)
(<a
href="https://redirect.github.com/nodejs/undici/issues/5428">#5428</a>)</li>
<li><a
href="https://github.com/nodejs/undici/commit/25efa447997f74d5881edd144525c3fd7db945a4"><code>25efa44</code></a>
fix(cookies): preserve values and parse SameSite strictly</li>
<li><a
href="https://github.com/nodejs/undici/commit/f4c31d60c42d0385bca6ad602c112706b0695212"><code>f4c31d6</code></a>
fix: guard idle socket validation to skip fresh sockets (<a
href="https://redirect.github.com/nodejs/undici/issues/5400">#5400</a>)</li>
<li>See full diff in <a
href="https://github.com/nodejs/undici/compare/v6.26.0...v6.27.0">compare
view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=undici&package-manager=npm_and_yarn&previous-version=6.26.0&new-version=6.27.0)](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 <dependency name> major version` will close this
group update PR and stop Dependabot creating any more for the specific
dependency's major version (unless you unignore this specific
dependency's major version or upgrade to it yourself)
- `@dependabot ignore <dependency name> minor version` will close this
group update PR and stop Dependabot creating any more for the specific
dependency's minor version (unless you unignore this specific
dependency's minor version or upgrade to it yourself)
- `@dependabot ignore <dependency name>` will close this group update PR
and stop Dependabot creating any more for the specific dependency
(unless you unignore this specific dependency or upgrade to it yourself)
- `@dependabot unignore <dependency name>` will remove all of the ignore
conditions of the specified dependency
- `@dependabot unignore <dependency name> <ignore condition>` will
remove the ignore condition of the specified dependency and ignore
conditions
You can disable automated security fix PRs for this repo from the
[Security Alerts page](https://github.com/npm/rfcs/network/alerts).

</details>

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

Author: dependabot[bot]