Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 allows HTTP Response Splitting. If a program using WEBrick inserts untrusted input into the response header, an attacker can exploit it to insert a newline character to split a header, and inject malicious content to deceive clients. NOTE: this issue exists because of an incomplete fix for CVE-2017-17742, which addressed the CRLF vector, but did not address an isolated CR or an isolated LF.
{
"versions": [
{
"introduced": "0"
},
{
"last_affected": "2.3.0"
},
{
"introduced": "2.4.0"
},
{
"last_affected": "2.4.7"
},
{
"introduced": "2.5.0"
},
{
"last_affected": "2.5.6"
},
{
"introduced": "2.6.0"
},
{
"last_affected": "2.6.4"
}
]
}