H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.
[
{
"product": "H2O",
"vendor": "Kazuho Oku",
"versions": [
{
"status": "affected",
"version": "versions 2.0.3 and earlier"
},
{
"status": "affected",
"version": "versions 2.1.0-beta2 and earlier"
}
]
}
]