fast-uri vulnerable to inconsistent host case normalization via percent-encoded octets
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| fast-uri | fast-uri | unaffected |
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| Fast-uri | Fast-uri |
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| Source | ID | Title |
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Github GHSA |
GHSA-hrr3-gc8f-f4qj | fast-uri vulnerable to inconsistent host case normalization via percent-encoded octets |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.253% probability within 30 days)
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threat_severity
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threat_severity
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ssvc
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| First Time appeared |
Fast-uri
Fast-uri fast-uri |
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Fast-uri
Fast-uri fast-uri |
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| Description | fast-uri is a dependency-free RFC 3986 URI parser for Node.js, used by Fastify and ajv. In versions before 2.4.7, from 3.0.0 through 3.1.7, and from 4.0.0 through 4.1.4, fast-uri folds the host to lowercase before it percent-decodes the host, so a percent-encoded uppercase octet such as %41 decodes to a literal A that is never folded. For a scheme-relative reference such as //host there is no scheme, so the host canonicalization that would normally repair this does not run, and parse, normalize, and equal then disagree on the same host. An application that makes a case-sensitive host decision on fast-uri output, for example a host allowlist or denylist that compares the parsed host or uses equal, can be steered past the check with a percent-encoded uppercase octet, and because hostnames are case-insensitive in DNS and HTTP the evading spelling still reaches the host the check meant to gate. The issue is fixed in fast-uri 2.4.7, 3.1.8, and 4.1.5, and users should upgrade to one of those versions or later. As a workaround, compare hosts case-insensitively by lowercasing the parsed host before any allowlist or denylist decision. | |
| Title | fast-uri vulnerable to inconsistent host case normalization via percent-encoded octets | |
| Weaknesses | CWE-178 | |
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| Metrics |
cvssV3_1
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