The parser in accepts requests with a space (SP) right after the header name before the colon. This can lead to HTTP Request Smuggling (HRS) in llhttp < v2.1.4 and < v6.0.6.
[
{
"product": "https://github.com/nodejs/llhttp",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "Fixed in llhttp v2.1.4 and v6.0.6"
}
]
}
]