fix(security): update dependency fast-uri to v4.1.2 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
fast-uri	4.1.1 → 4.1.2

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fast-uri vulnerable to host confusion via backslash authority introducer

CVE-2026-18446 / GHSA-7p8r-x3mc-p8w7

More information

Details

Impact

fast-uri v4.1.1 and earlier require a literal // to recognize a URI authority, so a reference that uses \\, /\, or \/ as the authority introducer (in place of //, after an optional scheme) is parsed with no authority: the sequence and everything after it fold into the path. Node's native WHATWG URL (used by fetch(), undici, and Node's http/https clients) instead treats \ as interchangeable with / for special schemes (http, https, ws, wss, ftp, file), so the two parsers extract different hosts from the same input.

For example, fast-uri resolves \\evil.com/path against base https://allowed.com/ to https://allowed.com/%5C%5Cevil.com/path (confined to the trusted host), while Node's WHATWG URL resolves the same reference to https://evil.com/path.

Applications that use fast-uri to enforce host-based policy (allowlists, denylists, loopback/SSRF filtering, redirect validation, outbound proxy routing) before passing the same URL into Node's URL or fetch() consumers see a policy/use desync and can be steered to an unintended destination.

Patches

Upgrade to fast-uri v4.1.2, v3.1.5, v2.4.4.

Workarounds

None. Upgrade to the patched version.

Severity

• CVSS Score: 7.5 / 10 (High)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

• https://github.com/fastify/fast-uri/security/advisories/GHSA-7p8r-x3mc-p8w7
• https://nvd.nist.gov/vuln/detail/CVE-2026-18446
• https://github.com/fastify/fast-uri/commit/f3c6c905f47831007490f466c5945012e905cc52
• https://cna.openjsf.org/security-advisories.html
• https://github.com/fastify/fast-uri/releases/tag/v4.1.2
• https://github.com/advisories/GHSA-7p8r-x3mc-p8w7

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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Release Notes

fastify/fast-uri (fast-uri)

v4.1.2

Compare Source

⚠️ Security Warning

Fix for GHSA-7p8r-x3mc-p8w7

What's Changed

• ci: pin actions to commit-hash by @​Fdawgs in #​189
• chore: bump actions/setup-node from 6.4.0 to 7.0.0 by @​dependabot[bot] in #​190
• docs: clarify security standards scope by @​mcollina in #​191
• ci: add ossf-scorecard workflow by @​Fdawgs in #​193
• ci(ossf-scorecard): add missing extension by @​Fdawgs in #​194

Full Changelog: fastify/fast-uri@v4.1.1...v4.1.2

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