AIKIDO-2026-10886
symfony/mailer is vulnerable to Argument Injection
76
High Risk
This Affects:
symfony/mailerTL;DR
SendmailTransport appends recipient addresses to the local sendmail command without separating them from options. A recipient address beginning with a dash can be interpreted by sendmail as an option instead of an address. Pre-fix applications using sendmail -t mode can pass attacker-influenced command options to the mailer binary. The fix inserts an end-of-options marker before recipient arguments.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
symfony/mailer is vulnerable to Argument 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/mailer and/or symfony/symfony library to the patch version.
Links
GitHub Releases
github.com/symfony/mailer/releases/tag/v8.0.12github.com/symfony/symfony/releases/tag/v5.4.52github.com/symfony/symfony/releases/tag/v6.4.40github.com/symfony/symfony/releases/tag/v7.4.12github.com/symfony/symfony/releases/tag/v8.0.12
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