chore(deps): update dependency fast-uri to v3.1.4 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
fast-uri	3.1.2 → 3.1.4

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fast-uri vulnerable to host confusion via failed IDN canonicalization

CVE-2026-13676 / GHSA-4c8g-83qw-93j6

More information

Details

Impact

fast-uri versions >= 2.3.1, <= 4.0.0 fail to canonicalize Unicode/IDN hostnames for HTTP-family URLs. The IDN conversion path calls URL.domainToASCII(...) on the global WHATWG URL constructor, where that helper does not exist. The resulting TypeError is silently routed into parsed.error, but parse(), normalize(), and equal() all return with the host left in its original Unicode form.

For example, http://127。0。0。1/ is treated by fast-uri as host 127。0。0。1, while Node's WHATWG URL parser and fetch() canonicalize the same input to 127.0.0.1.

Applications that use fast-uri to enforce host-based policy (denylists, loopback 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 v4.0.1, v3.1.3, or v2.4.2

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-4c8g-83qw-93j6
• https://nvd.nist.gov/vuln/detail/CVE-2026-13676
• https://github.com/fastify/fast-uri/pull/188
• https://github.com/fastify/fast-uri/commit/2a6d357a18a68e6d812824379fd3388a1ae50d05
• https://github.com/fastify/fast-uri/commit/21ea1f9d70495c931f55dff893a8fa38f4f2e6bd
• https://github.com/fastify/fast-uri/commit/01db48010f594b98f7b323be18b393791c66ed1d
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-13676.json
• https://github.com/fastify/fast-uri/releases/tag/v4.0.1
• https://github.com/fastify/fast-uri/releases/tag/v3.1.3
• https://github.com/fastify/fast-uri/releases/tag/v2.4.2
• https://github.com/fastify/fast-uri
• https://cna.openjsf.org/security-advisories.html
• https://bugzilla.redhat.com/show_bug.cgi?id=2494197
• https://access.redhat.com/security/cve/CVE-2026-13676
• https://access.redhat.com/errata/RHSA-2026:43038
• https://access.redhat.com/errata/RHSA-2026:42815
• https://access.redhat.com/errata/RHSA-2026:41929
• https://access.redhat.com/errata/RHSA-2026:41928
• https://access.redhat.com/errata/RHSA-2026:41066
• https://access.redhat.com/errata/RHSA-2026:40945
• https://access.redhat.com/errata/RHSA-2026:40262
• https://access.redhat.com/errata/RHSA-2026:40118
• https://access.redhat.com/errata/RHSA-2026:37628
• https://access.redhat.com/errata/RHSA-2026:37585
• https://access.redhat.com/errata/RHSA-2026:37186

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

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fast-uri vulnerable to host confusion via literal backslash authority delimiter

CVE-2026-16221 / GHSA-v2hh-gcrm-f6hx

More information

Details

Impact

fast-uri v4.1.0 and earlier do not treat a literal backslash (U+005C) as an authority delimiter. Node's native WHATWG URL (used by fetch(), undici, and Node's http/https clients) normalizes \ to / for special schemes (http, https, ws, wss, ftp, file), so the two parsers extract different hosts from the same input string.

For example, http://evil.com\@​allowed.com is treated by fast-uri as host allowed.com with userinfo evil.com\, while Node's WHATWG URL parser and fetch() see host evil.com with path /@​allowed.com.

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, including cloud metadata endpoints, loopback, or internal hosts.

Patches

Upgrade to fast-uri v4.1.1, v3.1.4, or v2.4.3.

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-v2hh-gcrm-f6hx
• https://nvd.nist.gov/vuln/detail/CVE-2026-16221
• https://github.com/fastify/fast-uri/commit/0542a216860fd70c062a4730e620576f62ded057
• https://github.com/fastify/fast-uri/commit/2d50fbabc80e4d0884fe0f6a98fe118ce6faa353
• https://github.com/fastify/fast-uri/commit/9438266d6a7ded688c8bc7c4ba506da17f44a17b
• https://cna.openjsf.org/security-advisories.html
• https://github.com/fastify/fast-uri
• https://github.com/fastify/fast-uri/releases/tag/v2.4.3
• https://github.com/fastify/fast-uri/releases/tag/v3.1.4
• https://github.com/fastify/fast-uri/releases/tag/v4.1.1

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

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Release Notes

fastify/fast-uri (fast-uri)

v3.1.4

Compare Source

⚠️ Security Release

Fix for GHSA-v2hh-gcrm-f6hx

Full Changelog: fastify/fast-uri@v3.1.3...v3.1.4

v3.1.3

Compare Source

⚠️ Security Release

• Fixes: GHSA-4c8g-83qw-93j6

Full Changelog: fastify/fast-uri@v3.1.2...v3.1.3

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