When using the sandbox with a SourcePolicyInterface, Twig does not always apply the sandbox restriction that forbids non-Closure callbacks for callback-accepting filters.
The issue affects the sort, filter, map, and reduce filters.
In the affected versions, the runtime check that rejects non-Closure callbacks in sandbox mode does not use the current template Source. As a result, when the sandbox is enabled through a source policy instead of being enabled globally, Twig can incorrectly treat the current execution as non-sandboxed for these callback checks.
This can allow user-controlled templates to pass arbitrary PHP callables to callback-accepting filters even though the template is being sandboxed through a source policy.
The issue happens when all these conditions are met:
SourcePolicyInterface enables the sandbox for the rendered template;sort, filter, map, or reduce filters;Closure.The patch makes callback sandbox checks source-aware by propagating the current template Source to callback-accepting filters and using it when deciding whether sandbox restrictions apply.
We would like to thank XavLim and Wade Sparks for reporting the issue and Fabien Potencier for fixing the issue.
| Score | Percentile |
|---|---|
| 0.11% | 29.71% |
| Base score | Version | Severity | Vector |
|---|---|---|---|
| 8.8 | 3.1 | — |
|
| 8.7 | 4.0 | — |
|
| Type | Value |
|---|---|
| GHSA | GHSA-2q52-x2ff-qgfr ↗ |
| CVE | CVE-2026-24425 ↗ |
| CWE id | Name |
|---|---|
| CWE-693 | Protection Mechanism Failure |
Vulnerable version ranges and first patched releases as published by GitHub.
| Ecosystem | Package | Vulnerable range | First patched | Vulnerable functions |
|---|---|---|---|---|
| composer | twig/twig | >= 2.16.0, <= 2.16.1 | — | — |
| composer | twig/twig | >= 3.9.0, < 3.26.0 | 3.26.0 | — |