CVE-2026-33131
- Source
- https://cve.org/CVERecord?id=CVE-2026-33131
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33131.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-33131
- Aliases
- Published
- 2026-03-20T10:16:29Z
- Modified
- 2026-08-12T03:51:31Z
- Severity
-
- 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
- Summary
- h3 has a middleware bypass with one gadget
- Details
-
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.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-290" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33131.json" }- References
Affected packages
Git / github.com/h3js/h3
Affected ranges
- Type
- GIT
- Repo
- https://github.com/h3js/h3
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "introduced": "2.0.0-0" }, { "fixed": "2.0.1-rc.15" }, { "fixed": "2.0.1-rc.14" } ], "source": [ "AFFECTED_FIELD", "DESCRIPTION" ] }