{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-100700","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-09-26T02:39:50.973Z","datePublished":"2026-09-26T13:23:56.526Z","dateUpdated":"2026-09-26T13:23:56.526Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-09-26T13:23:56.526Z"},"datePublic":"2026-09-11T00:00:00.000Z","title":"nodemailer before 10.0.6 Denial of Service via addressparser","descriptions":[{"lang":"en","value":"nodemailer before 10.0.6 contains a denial of service vulnerability in the addressparser free-text fallback regex pattern that exhibits quadratic backtracking behavior. Attackers can supply crafted email header values with long whitespace-free runs to block the Node.js event loop for tens of seconds, causing service unavailability."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Inefficient Algorithmic Complexity","cweId":"CWE-407","type":"CWE"}]}],"affected":[{"vendor":"nodemailer","product":"nodemailer","defaultStatus":"unaffected","packageURL":"pkg:npm/nodemailer","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"10.0.6"},{"version":"10.0.6","status":"unaffected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:nodemailer:nodemailer:*:*:*:*:*:*:*:*","versionEndExcluding":"10.0.6"}]}]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH"}}],"references":[{"url":"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-v53p-9fqp-m79j","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-v53p-9fqp-m79j)"},{"name":"VulnCheck Advisory: nodemailer before 10.0.6 Denial of Service via addressparser","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/nodemailer-before-10.0.6-denial-of-service-via-addressparser"}],"x_generator":{"engine":"vulncheck-endgame"}}}}