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-2026-6322

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-2026-84292

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...