Unguarded calls to __toString() when nesting an object into an array in Twig
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-668 and the CVSS impact.
Summary
Twig is a template language for PHP. In a sandbox, an attacker can call `__toString()` on an object even if the `__toString()` method is not allowed by the security policy when the object is part of an array or an argument list (arguments to a function or a filter for instance). This issue has been patched in versions 3.11.2 and 3.14.1. All users are advised to upgrade. There are no known workarounds for this issue.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| symfony | Twig | before 3.11.2; 3.12.0 to before 3.14.1 | 3.11.2, 3.14.1 | Patch available | CNA |
| — | twig/twig (Packagist) | before 3.11.2 | 3.11.2 | Patch available | GHSA-6377-hfv9-hqf6 |
| — | twig/twig (Packagist) | 3.12 to before 3.14.1 | 3.14.1 | Patch available | GHSA-6377-hfv9-hqf6 |
- Twig Vendorsymfony Affected before 3.11.2; 3.12.0 to before 3.14.1 Fixed in 3.11.2, 3.14.1 Patch available CNA
- twig/twig (Packagist) Vendor— Affected before 3.11.2 Fixed in 3.11.2 Patch available GHSA-6377-hfv9-hqf6
- twig/twig (Packagist) Vendor— Affected 3.12 to before 3.14.1 Fixed in 3.14.1 Patch available GHSA-6377-hfv9-hqf6
Remediation
- Fix · CNA Twig (twigphp) Fixed in 3.11.2, 3.14.1
- Fix · GHSA-6377-hfv9-hqf6 twig/twig (Packagist) Fixed in 3.11.2 Advisory →
- Fix · GHSA-6377-hfv9-hqf6 twig/twig (Packagist) Fixed in 3.14.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2024-51754
- 2026-10-03 Alias added: GHSA-6377-hfv9-hqf6
References
Other 6
- https://github.com/twigphp/Twig/security/advisories/GHSA-6377-hfv9-hqf6
- https://github.com/twigphp/Twig/commit/2bb8c2460a2c519c498df9b643d5277117155a73
- https://github.com/FriendsOfPHP/security-advisories/blob/master/twig/twig/CVE-2024-51754.yaml
- https://github.com/twigphp/Twig
- https://lists.debian.org/debian-lts-announce/2025/05/msg00039.html
- https://symfony.com/blog/unguarded-calls-to-__tostring-when-nesting-an-object-into-an-array
More symfony vulnerabilities
- TI-2024-33775 Ability to change environment from query in symfony/runtime CVSS 3.1HIGH 7.3
- TI-2026-34283 Twig: The `spaceless` filter implicitly marks its output as safe CVSS 4.0MEDIUM 5.1
- TI-2022-07667 Code injection in Twig CVSS 3.1CRITICAL 9.8
- TI-2018-10028 Twig before 2.4.4 allows Server-Side Template Injection (SSTI) via the search search_key… CVSS 3.0CRITICAL 9.8
- TI-2026-35851 Incorrect authorization in symfony CVSS 4.0HIGH 8.7
- TI-2026-35264 Improper input validation in symfony CVSS 4.0HIGH 8.3
Sources
- CVE-2024-51754 · CVE Program
- CVE-2024-51754 · NVD
- FIRST EPSS
- GHSA-6377-hfv9-hqf6 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences