CVE-2026-16221

Impact: fast-uri versions from 2.3.1 through 4.1.0 including the 3.x line up to 3.1.3 and the 2.x line up to 2.4.2 do not treat a literal backslash character U+005C as an authority delimiter. Node's native WHATWG URL parser, used by fetch, undici, and Node's http and https clients, normalizes the...

CVE-2026-16221

creationtimestamp| type| source ---|---|--- 2026-07-19 14:22:06+00:00| seen| https://bsky.app/profile/ulisesgascon.com/post/3mqyy3s7vts2h 2026-07-19 16:00:20+00:00| seen| https://bsky.app/profile/thehackerwire.bsky.social/post/3mqz5lio7ut2d 2026-07-19 16:04:10+00:00| seen|...

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...