In the CGI gem before 0.4.2 for Ruby, a Regular Expression Denial of Service (ReDoS) vulnerability exists in the Util#escapeElement method.
{
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27220.json",
"cna_assigner": "mitre",
"unresolved_ranges": [
{
"extracted_events": [
{
"fixed": "0.3.5.1"
},
{
"introduced": "0.3.6"
},
{
"fixed": "0.3.7"
},
{
"introduced": "0.4.0"
},
{
"fixed": "0.4.2"
}
],
"source": "AFFECTED_FIELD"
},
{
"extracted_events": [
{
"fixed": "0.3.5.1"
},
{
"introduced": "0.3.6"
},
{
"fixed": "0.3.7"
},
{
"introduced": "0.4.0"
},
{
"fixed": "0.4.2"
}
],
"source": "CPE_FIELD"
},
{
"extracted_events": [
{
"fixed": "0.4.2"
}
],
"source": "DESCRIPTION"
}
],
"cwe_ids": [
"CWE-1333"
]
}{
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "0.3.5.1"
},
{
"last_affected": "0.3.6"
},
{
"introduced": "0.4.0"
},
{
"fixed": "0.4.2"
}
],
"cpe": [
"cpe:2.3:a:ruby-lang:cgi:*:*:*:*:*:ruby:*:*",
"cpe:2.3:a:ruby-lang:cgi:0.3.6:*:*:*:*:ruby:*:*"
],
"source": [
"CPE_RANGE",
"CPE_STRING"
]
}