AIKIDO-2026-455080
symfony/twig-bridge is vulnerable to Deserialization of Untrusted Data
59
Medium Risk
This Affects:
symfony/twig-bridgeTL;DR
The TemplatedEmail and NotificationEmail classes restore typed string properties (such as htmlTemplate, textTemplate, locale, and theme) directly from the raw array passed to __unserialize(). When an attacker-controlled serialized payload places a \Stringable object into one of those string slots, PHP coerces it through __toString() before any validation runs, firing the gadget during unserialization. An application that deserializes untrusted data into these classes can therefore trigger attacker-chosen __toString() logic. The fix rejects \Stringable values in the raw data before any typed-string assignment and throws an exception.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application deserializes untrusted data into the TemplatedEmail or NotificationEmail classes.
Background info
symfony/twig-bridge is vulnerable to Deserialization of Untrusted Data in versions 6.0.0 - 6.4.40, 7.0.0 - 7.4.12, 8.0.0 - 8.0.12 and 8.1.0 - 8.1.0.
How to fix this
Upgrade the symfony/twig-bridge and/or the symfony/symfony library to the patch version.
Are You Affected?
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