Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malicious email headers with comment-separated atoms to consume excessive CPU and block the Node.js event loop for several seconds, causing denial of service.
{
"cna_assigner": "VulnCheck",
"cwe_ids": [
"CWE-407"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90776.json",
"unresolved_ranges": [
{
"extracted_events": [
{
"introduced": "9.1.0"
},
{
"fixed": "10.0.5"
}
],
"source": "AFFECTED_FIELD"
},
{
"extracted_events": [
{
"introduced": "9.1.0"
},
{
"fixed": "10.0.5"
}
],
"source": "CPE_FIELD"
},
{
"extracted_events": [
{
"introduced": "9.1.0"
},
{
"fixed": "10.0.4"
}
],
"source": "DESCRIPTION"
}
]
}