EUVD-2026-64758Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
AC:H reflects the required application-pattern precondition (two-step validate-then-resolve with scheme-relative input); all other metrics match the supplied vector.
Primary rating from Vendor (openjs).
CVSS VectorVendor: openjs
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
3DescriptionCVE.org
fast-uri is a URI parser for Node.js. It canonicalizes a host to its ASCII form only when the input carries an explicit scheme, so a scheme-relative reference such as a host preceded by two slashes is returned with its host verbatim and no error set. As a result fast-uri's own entry points disagree with each other: parse, resolve, normalize, and equal can yield different hosts for the same input depending only on whether a scheme is written out, and equal can return opposite verdicts for the same pair of hosts. An application that extracts a host with fast-uri to check it against a policy list and then resolves the same reference can make its decision on one host while the destination is another, enabling host confusion and policy bypass. The affected versions are 2.4.2 up to but not including 2.4.5, 3.1.3 up to but not including 3.1.6, and 4.0.1 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which canonicalize the host consistently across the resolve path. Users should upgrade to a patched version.
Articles & Coverage 2
AnalysisAI
Host confusion in fast-uri, a Node.js URI parser in the Fastify ecosystem, allows policy bypass by exploiting inconsistent host canonicalization between the library's own entry points. When a scheme-relative reference (e.g., //unicode-host.example/path) is passed without an explicit scheme, fast-uri's parse, normalize, and equal functions return the host verbatim, while resolve canonicalizes it to ASCII/Punycode - meaning the same input yields different host values depending on which API is called. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerability requires two specific conditions to be simultaneously true in the target application. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD-assigned CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N scores 7.5 (High). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker targeting a Node.js application that uses fast-uri for SSRF protection submits a request containing a scheme-relative URI such as //внутренний.corp/admin (an internationalized hostname). The application's allowlist check calls fast-uri's parse, which returns the Cyrillic hostname verbatim and matches a permitted pattern. … |
| Remediation | Vendor-released patches are available: upgrade fast-uri to version 2.4.5, 3.1.6, or 4.1.3 depending on the currently installed major/minor branch. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all internal and third-party applications using fast-uri and assess which rely on URI-based policy validation for security decisions. …
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External POC / Exploit Code
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