{"cve":"CVE-2026-45067","nvd":{"published":"2026-07-14T18:17:16.847","modified":"2026-07-14T20:25:54.190","status":"Awaiting Analysis","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.","cvss_v4":{"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","score":6.3},"cvss_v3":null,"cwes":["CWE-93"],"references":["https://github.com/symfony/symfony/commit/a1c42cbe517bc146a54da7505a107ded317478fe","https://github.com/symfony/symfony/releases/tag/v5.4.52","https://github.com/symfony/symfony/releases/tag/v6.4.40","https://github.com/symfony/symfony/releases/tag/v7.4.12","https://github.com/symfony/symfony/releases/tag/v8.0.12"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:44:02.134301115+00:00"},"epss":{"cve":"CVE-2026-45067","score":0.00598,"percentile":0.48631,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}