CVE-2026-45067
Description
Description
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.
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. 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.
Resolution
The Address constructor now rejects addresses containing line breaks.
The patch for this issue is available here for branch 5.4.
Credits
We would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
symfony/mimePackagist | < 5.4.52 | 5.4.52 |
symfony/symfonyPackagist | < 5.4.52 | 5.4.52 |
symfony/mimePackagist | >= 6.0.0, < 6.4.40 | 6.4.40 |
symfony/mimePackagist | >= 7.0.0, < 7.4.12 | 7.4.12 |
symfony/mimePackagist | >= 8.0.0, < 8.0.12 | 8.0.12 |
symfony/symfonyPackagist | >= 6.0.0, < 6.4.40 | 6.4.40 |
symfony/symfonyPackagist | >= 7.0.0, < 7.4.12 | 7.4.12 |
symfony/symfonyPackagist | >= 8.0.0, < 8.0.12 | 8.0.12 |
Affected products
4- osv-coords4 versionspkg:apk/chainguard/nextcloud-server-33pkg:apk/wolfi/nextcloud-server-33pkg:composer/symfony/mimepkg:composer/symfony/symfony
< 33.0.5-r2+ 3 more
- (no CPE)range: < 33.0.5-r2
- (no CPE)range: < 33.0.5-r2
- (no CPE)range: < 5.4.52
- (no CPE)range: < 5.4.52
Patches
Vulnerability mechanics
References
11- github.com/advisories/GHSA-qpmx-3rfj-7rhvghsaADVISORY
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/mime/CVE-2026-45067.yamlghsaWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45067.yamlghsaWEB
- github.com/symfony/symfony/commit/dc2dbd29211eb4ddc451373fa1374fb926e94604ghsaWEB
- github.com/symfony/symfony/security/advisories/GHSA-qpmx-3rfj-7rhvnvdWEB
- symfony.com/cve-2026-45067ghsaWEB
- github.com/symfony/symfony/commit/a1c42cbe517bc146a54da7505a107ded317478fenvd
- github.com/symfony/symfony/releases/tag/v5.4.52nvd
- github.com/symfony/symfony/releases/tag/v6.4.40nvd
- github.com/symfony/symfony/releases/tag/v7.4.12nvd
- github.com/symfony/symfony/releases/tag/v8.0.12nvd
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