CVE-2026-45073: Symfony Vulnerable to SQL Injection in PdoAdapter::doClear() via Unsanitized $prefix

Symfony\Component\Cache\Adapter\PdoAdapter is the PDO-backed cache adapter. Its clear($prefix) method (inherited from AbstractAdapterTrait) is documented to delete cache items whose key starts with $prefix.

In the non-versioning code path, the caller-supplied $prefix is concatenated into $namespace = $this->namespace.$prefix and passed to PdoAdapter::doClear(), which builds:

DELETE FROM <table> WHERE <id_col> LIKE '<namespace>%'

The value is interpolated directly into the SQL text and executed with PDO::exec(): $namespace is not bound. A caller able to influence $prefix can break out of the literal and inject SQL, expanding deletion scope from the intended prefix to arbitrary rows, or otherwise reshape query semantics.

Most applications don’t expose clear($prefix) to untrusted input directly, but the contract of the method is to safely accept any prefix string, so the lack of escaping is a defect of the adapter itself.