An issue was discovered in Squid before 4.12 and 5.x before 5.0.3. Due to use of a potentially dangerous function, Squid and the default certificate validation helper are vulnerable to a Denial of Service when opening a TLS connection to an attacker-controlled server for HTTPS. This occurs because unrecognized error values are mapped to NULL, but later code expects that each error value is mapped to a valid error string.
{
"versions": [
{
"introduced": "3.1"
},
{
"last_affected": "3.5.28"
},
{
"introduced": "4.0"
},
{
"fixed": "4.12"
},
{
"introduced": "5.0"
},
{
"fixed": "5.0.3"
}
]
}