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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| symfony | symfony | < 5.4.52, >= 6.0.0-BETA1, < 6.4.40, >= 7.0.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | symfony | 7.4.12+dfsg-1 | — |
| Debian 13 | symfony | 6.4.41+dfsg-0+deb13u1 | — |
| Debian 12 | symfony | 5.4.53+dfsg-0+deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | symfony | No fix yet | — |
| Ubuntu 26.04 LTS | symfony | No fix yet | — |
| Ubuntu 25.10 | symfony | No fix yet | — |
| Ubuntu 16.04 LTS | symfony | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | symfony | No fix yet | — |
| Ubuntu Pro 22.04 LTS | symfony | No fix yet | — |
| Ubuntu Pro 20.04 LTS | symfony | No fix yet | — |
| Ubuntu Pro 18.04 LTS | symfony | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | nextcloud-server-33 | 33.0.5-r2 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
-
HORKimhab/CVE-2026-45067 ★ 0 · Jun 9, 2026
CVE-2026-45067 - Draft
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | symfony/mime | < 5.4.52 | 5.4.52 | GHSA-qpmx-3rfj-7rhv |
| Packagist | symfony/mime | >= 6.0.0, < 6.4.40 | 6.4.40 | GHSA-qpmx-3rfj-7rhv |
| Packagist | symfony/mime | >= 7.0.0, < 7.4.12 | 7.4.12 | GHSA-qpmx-3rfj-7rhv |
| Packagist | symfony/mime | >= 8.0.0, < 8.0.12 | 8.0.12 | GHSA-qpmx-3rfj-7rhv |
| Packagist | symfony/symfony | < 5.4.52 | 5.4.52 | GHSA-qpmx-3rfj-7rhv |
| Packagist | symfony/symfony | >= 6.0.0, < 6.4.40 | 6.4.40 | GHSA-qpmx-3rfj-7rhv |
| Packagist | symfony/symfony | >= 7.0.0, < 7.4.12 | 7.4.12 | GHSA-qpmx-3rfj-7rhv |
| Packagist | symfony/symfony | >= 8.0.0, < 8.0.12 | 8.0.12 | GHSA-qpmx-3rfj-7rhv |
References
- https://github.com/symfony/symfony/security/advisories/GHSA-qpmx-3rfj-7rhv
- 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