# CVE-2026-45067: symfony: ### Description  `Symfony\Component\Mime\Address` is the value-object every Symfony Mailer address (to/cc/bcc/from/re...

CVE-2026-45067 is fixed in symfony on 1 platform, first by DEBIAN-CVE-2026-45067, released May 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-45067
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0060
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 14, 2026

## 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](https://github.com/symfony/symfony/commit/dc2dbd29211eb4ddc451373fa1374fb926e94604) for branch 5.4.  ### Credits  We would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | symfony Debian 12.15 (bookworm) | 5.4.53+dfsg-0+deb12u1 | [DEBIAN-CVE-2026-45067](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45067.md) | May 27, 2026 |
| Linux | symfony Debian 13.5 (trixie) | 6.4.41+dfsg-0+deb13u1 | [DEBIAN-CVE-2026-45067](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45067.md) | May 27, 2026 |
| Linux | symfony Debian 14 | 7.4.12+dfsg-1 | [DEBIAN-CVE-2026-45067](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45067.md) | May 27, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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