H3 is a minimal H(TTP) framework. Versions 2.0.0-0 through 2.0.1-rc.14 contain a Host header spoofing vulnerability in the NodeRequestUrl (which extends FastURL) which allows middleware bypass. When event.url, event.url.hostname, or event.url._url is accessed, such as in a logging middleware, the _url getter constructs a URL from untrusted data, including the user-controlled Host header.
Because H3's router resolves the route handler before middleware runs, an attacker can supply a crafted Host header (e.g., Host: localhost:3000/abchehe?) to make the middleware path check fail while the route handler still matches, effectively bypassing authentication or authorization middleware. This affects any application built on H3 (including Nitro/Nuxt) that accesses event.url properties in middleware guarding sensitive routes. The issue requires an immediate fix to prevent FastURL.href from being constructed with unsanitized, attacker-controlled input.
Version 2.0.1-rc.15 contains a patch for this issue.
Attack Parameters
Impact Assessment
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 14
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
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H3 H3
cpe:2.3:a:h3:h3:2.0.0:*:*:*:*:node.js:*:*
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— | — |
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H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc10:*:*:*:node.js:*:*
|
— | — |
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H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc11:*:*:*:node.js:*:*
|
— | — |
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H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc12:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc13:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc14:*:*:*:node.js:*:*
|
— | — |
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H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc2:*:*:*:node.js:*:*
|
— | — |
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H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc3:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc4:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc5:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc6:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc7:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc8:*:*:*:node.js:*:*
|
— | — |
|
H3 H3
cpe:2.3:a:h3:h3:2.0.1:rc9:*:*:*:node.js:*:*
|
— | — |