AIKIDO-2026-10881
symfony/mime is vulnerable to CRLF Injection
65
Medium Risk
This Affects:
symfony/mimeTL;DR
Address accepts email addresses that contain raw line breaks inside quoted local parts. Those addresses later flow into rendered mail headers and SMTP protocol commands. Pre-fix applications can allow CRLF injection into message headers or SMTP commands when addresses are influenced by untrusted input. The fix rejects addresses containing line breaks.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
symfony/mime is vulnerable to CRLF Injection in versions 0.0.1 - 5.4.51, 6.0.0 - 6.4.39, 7.0.0 - 7.4.11 and 8.0.0 - 8.0.11.
How to fix this
Upgrade the symfony/mime and/or symfony/symfony library to the patch version.
Are You Affected?
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SOC 2Compliant
ISO 27001Compliant