Описание
fast-uri vulnerable to host confusion via failed IDN canonicalization
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.
Ссылки
- 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://access.redhat.com/errata/RHSA-2026:37186
- https://access.redhat.com/errata/RHSA-2026:51196
- https://access.redhat.com/errata/RHSA-2026:51197
- https://access.redhat.com/errata/RHSA-2026:51342
- https://access.redhat.com/errata/RHSA-2026:51348
- https://access.redhat.com/errata/RHSA-2026:51349
- https://access.redhat.com/errata/RHSA-2026:54760
- https://access.redhat.com/security/cve/CVE-2026-13676
- https://bugzilla.redhat.com/show_bug.cgi?id=2494197
- https://cna.openjsf.org/security-advisories.html
- https://github.com/fastify/fast-uri/releases/tag/v2.4.2
- https://github.com/fastify/fast-uri/releases/tag/v3.1.3
- https://github.com/fastify/fast-uri/releases/tag/v4.0.1
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-13676.json
- https://access.redhat.com/errata/RHSA-2026:37585
- https://access.redhat.com/errata/RHSA-2026:37628
- https://access.redhat.com/errata/RHSA-2026:40118
- https://access.redhat.com/errata/RHSA-2026:40262
- https://access.redhat.com/errata/RHSA-2026:40765
- https://access.redhat.com/errata/RHSA-2026:40945
- https://access.redhat.com/errata/RHSA-2026:41066
- https://access.redhat.com/errata/RHSA-2026:41928
- https://access.redhat.com/errata/RHSA-2026:41929
- https://access.redhat.com/errata/RHSA-2026:42815
- https://access.redhat.com/errata/RHSA-2026:43038
- https://access.redhat.com/errata/RHSA-2026:44239
- https://access.redhat.com/errata/RHSA-2026:44268
- https://access.redhat.com/errata/RHSA-2026:47728
- https://access.redhat.com/errata/RHSA-2026:48124
- https://access.redhat.com/errata/RHSA-2026:48126
- https://access.redhat.com/errata/RHSA-2026:49642
- https://access.redhat.com/errata/RHSA-2026:50340
- https://access.redhat.com/errata/RHSA-2026:50479
- https://access.redhat.com/errata/RHSA-2026:50758
Пакеты
fast-uri
>= 4.0.0, < 4.0.1
4.0.1
fast-uri
>= 3.0.0, < 3.1.3
3.1.3
fast-uri
>= 2.3.1, < 2.4.2
2.4.2
Связанные уязвимости
fast-uri versions 2.3.1 through 3.1.2 and 4.0.0 fail to canonicalize Unicode (IDN) hostnames for HTTP-family URLs. The IDN conversion path calls a helper that does not exist on the global URL constructor, silently leaving the host in its original Unicode form while normalize() and equal() still return values that differ from a WHATWG-compatible URL parser. Applications that use fast-uri to enforce host-based policy (denylists, loopback filtering, redirect validation, outbound proxy routing) before passing the same URL to Node's URL or fetch can be bypassed when the two implementations resolve the same input to different hosts. Patches: upgrade to fast-uri 3.1.3 for the 3.x line or 4.0.1 for the 4.x line. Workarounds: enforce host policy using the same URL parser used for the actual request, or reject non-ASCII hosts before policy checks.
fast-uri versions 2.3.1 through 3.1.2 and 4.0.0 fail to canonicalize Unicode (IDN) hostnames for HTTP-family URLs. The IDN conversion path calls a helper that does not exist on the global URL constructor, silently leaving the host in its original Unicode form while normalize() and equal() still return values that differ from a WHATWG-compatible URL parser. Applications that use fast-uri to enforce host-based policy (denylists, loopback filtering, redirect validation, outbound proxy routing) before passing the same URL to Node's URL or fetch can be bypassed when the two implementations resolve the same input to different hosts. Patches: upgrade to fast-uri 3.1.3 for the 3.x line or 4.0.1 for the 4.x line. Workarounds: enforce host policy using the same URL parser used for the actual request, or reject non-ASCII hosts before policy checks.
fast-uri versions 2.3.1 through 3.1.2 and 4.0.0 fail to canonicalize Unicode (IDN) hostnames for HTTP-family URLs. The IDN conversion path calls a helper that does not exist on the global URL constructor, silently leaving the host in its original Unicode form while normalize() and equal() still return values that differ from a WHATWG-compatible URL parser. Applications that use fast-uri to enforce host-based policy (denylists, loopback filtering, redirect validation, outbound proxy routing) before passing the same URL to Node's URL or fetch can be bypassed when the two implementations resolve the same input to different hosts. Patches: upgrade to fast-uri 3.1.3 for the 3.x line or 4.0.1 for the 4.x line. Workarounds: enforce host policy using the same URL parser used for the actual request, or reject non-ASCII hosts before policy checks.
fast-uri versions 2.3.1 through 3.1.2 and 4.0.0 fail to canonicalize U ...
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