{"id":"CVE-2026-45067","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-45067","generatedAt":"2026-10-28T10:46:47.799Z","title":"The constructor accepts email addresses whose local-part (the part before `@`) is an RFC-5322 *quoted string* containing raw `\\r\\n` bytes — e.g. `\"x\\r\\nBcc: attacker@evil\"@example.com`.","description":"### Description\n\n`Symfony\\Component\\Mime\\Address` is the value-object every Symfony Mailer address (to/cc/bcc/from/reply-to) flows through; its constructor is documented as validating the address and throwing on invalid input, so developers treat it as a security boundary.\n\nThe constructor accepts email addresses whose local-part (the part before `@`) is an RFC-5322 *quoted string* containing raw `\\r\\n` bytes — e.g. `\"x\\r\\nBcc: attacker@evil\"@example.com`. The stored address is later emitted verbatim into (1) the rendered message headers and (2) `SmtpTransport`'s `MAIL FROM:<...>` / `RCPT TO:<...>` protocol lines, turning the embedded CRLF into a new mail header and/or a new SMTP command.\n\n### Resolution\n\nThe `Address` constructor now rejects addresses containing line breaks.\n\nThe patch for this issue is available [here](https://github.com/symfony/symfony/commit/dc2dbd29211eb4ddc451373fa1374fb926e94604) for branch 5.4.\n\n### Credits\n\nWe would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.","published":"2026-07-14T18:17:17.000Z","lastModified":"2026-07-14T20:25:54.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":6.3,"severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-93"],"affected":[],"epss":{"score":0.00598,"percentile":0.48404,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.60%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/symfony/symfony/commit/a1c42cbe517bc146a54da7505a107ded317478fe","source":"security-advisories@github.com"},{"url":"https://github.com/symfony/symfony/releases/tag/v5.4.52","source":"security-advisories@github.com"},{"url":"https://github.com/symfony/symfony/releases/tag/v6.4.40","source":"security-advisories@github.com"},{"url":"https://github.com/symfony/symfony/releases/tag/v7.4.12","source":"security-advisories@github.com"},{"url":"https://github.com/symfony/symfony/releases/tag/v8.0.12","source":"security-advisories@github.com"},{"url":"https://github.com/symfony/symfony/security/advisories/GHSA-qpmx-3rfj-7rhv","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45067","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}