Symfony Vulnerable to SQL Injection in PdoAdapter::doClear() via Unsanitized $prefix
Description
Symfony\Component\Cache\Adapter\PdoAdapter is the PDO-backed cache adapter. Its clear($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.
Resolution
AbstractAdapterTrait::clear() now rejects any $prefix containing characters outside [-+.A-Za-z0-9]: when an invalid prefix is supplied, the method logs a warning and returns false instead of reaching the SQL layer. This blocks quotes, %, null bytes and other characters that would let an attacker break out of the LIKE literal.
The patch for this issue is available here for branch 5.4.
Credits
Symfony would like to thank secsys_codex for reporting the issue and Nicolas Grekas for fixing it.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | symfony/cache | < 5.4.52, >= 6.0.0, < 6.4.40, >= 7.0.0, < 7.4.12, >= 8.0.0, < 8.0.12 | 5.4.52, 6.4.40, 7.4.12, 8.0.12 |
| Composer package | symfony/symfony | < 5.4.52, >= 6.0.0, < 6.4.40, >= 7.0.0, < 7.4.12, >= 8.0.0, < 8.0.12 | 5.4.52, 6.4.40, 7.4.12, 8.0.12 |
References
- https://github.com/symfony/symfony/security/advisories/GHSA-6qh9-h6wf-jgqc
- https://github.com/symfony/symfony/commit/ec50b799d79ebe24561f29351c1efcb6da95c9b
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/cache/CVE-2026-45073.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45073.yaml
- https://github.com/symfony/symfony
- https://symfony.com/cve-2026-45073
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:U- Weakness (CWE)
CWE-89- Platform
- Composer
- Package
symfony/cache, symfony/symfony- Disclosed
- 27.05.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-6qh9-h6wf-jgqc - CC BY 4.0
Vulnerability history: symfony/cache
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 12.2019 05.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 1
- Medium 1
Disclosures per year
- 2019: 1
- 2020: 1
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 1
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Symfony Vulnerable to SQL Injection in PdoAdapter::doClear() via Unsanitized $prefix this entry
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