CVE-2026-16221

CVE-2026-16221 affects fast-uri versions 2.3.1–4.1.0 (including 3.x up to 3.1.3 and 2.x up to 2.4.2). The root cause is that a literal backslash (U+005C) is not treated as an authority delimiter, causing two URL parsers to extract different hosts from the same input. Node’s native WHATWG URL pars...

CVE-2026-18446

CVE-2026-18446 affects the fast-uri library prior to versions 4.1.2, 3.1.5, and 2.4.4 . A backslash-based introducer can substitute for a literal double forward slash required to recognize a URI authority, causing fast-uri to misparse the host while Node’s WHATWG URL parser treats backslashes dif...

CVE-2026-13676

The CVE concerns the fast-uri library (versions 2.3.1–3.1.2 and 4.0.0) where the IDN host canonicalization path fails to normalize Unicode hosts for HTTP URLs. A helper used in IDN conversion does not exist on the global URL constructor, leaving the host in Unicode form while normalize() and equa...

CVE-2026-6322

CVE-2026-6322 affects the fast-uri package. The vuln lies in normalize(): it decodes percent-encoded authority delimiters inside the host and then re-emits them as raw delimiters during serialization. This can cause a host, which combines an allowed domain, an encoded at-sign, and a different dom...

CVE-2026-6321

Affected software: fast-uri. Vulnerability: percent-encoded path separators and dot segments are decoded before dot‑segment removal in normalize() and equal() so encoded data is treated like real slashes and parent directories, allowing distinct URIs to normalize to the same path. Impact: applica...

CVE-2026-75931

fast-uri , a URI parser for the Node.js ecosystem, is vulnerable to host confusion and policy bypass (CVSS 3.1: 7.5 HIGH ). The root cause is that the host is canonicalized to ASCII form only when the input carries an explicit scheme; scheme-relative references (host preceded by //) are returned ...

CVE-2026-75975

fast-uri is a URI parser for Node.js whose custom bracketed IPv6 literal parser fails to validate the full IPv6 grammar. Invalid trailing text in an authority is silently discarded, causing a malformed attacker-controlled host to normalize to a different valid IPv6 destination (e.g., the unspecif...

CVE-2026-76172

fast-uri , a URI parser for Node.js, is vulnerable to host confusion via percent-encoded scheme normalization . The root cause is a legacy decoding pass applied to the scheme component that is never re-escaped before serialization, causing a mismatch between the parsed host (undefined) and the re...

CVE-2026-75899

fast-uri , a URI parser for Node.js, suffers from double percent-decoding of the hostname: it decodes percent escapes during parsing and decodes them again during authority recomposition. This violates RFC 3986 §2.4 (an implementation must not decode the same string more than once) and allows a s...

CVE-2026-84292

fast-uri , a URI library in the Fastify ecosystem, fails to validate the port component when serializing an authority. The recomposeAuthority function concatenates the port verbatim without escaping, so a crafted non-digit value (e.g., containing @) can inject authority delimiters, demoting the i...

CVE-2026-84394

fast-uri (a URI parsing library used by the Fastify ecosystem) contains a host confusion vulnerability: when a URI's authority contains an opening bracket [ without a matching closing bracket ], parse() returns the string as the host without error. Neither an IP literal nor a valid domain name is...