| Package | Affected versions | Patched versions |
|---|---|---|
| symfony/http-foundation | ≥ 4.4.0, < 4.4.7≥ 5.0.0, < 5.0.7 | 4.4.75.0.7 |
| symfony/symfony | ≥ 4.4.0, < 4.4.7≥ 5.0.0, < 5.0.7 | 4.4.75.0.7 |
| symfony | ≥ 4.4.0, < 4.4.7≥ 5.0.0, < 5.0.7 | 4.4.75.0.7 |
When a Response does not contain a Content-Type header, Symfony falls back to the format defined in the Accept header of the request, leading to a possible mismatch between the response's content and Content-Type header. When the response is cached, this can lead to a corrupted cache where the cached format is not the right one.
Symfony does not use the Accept header anymore to guess the Content-Type.
The patch for this issue is available here for the 4.4 branch.
I would like to thank Xavier Lacot from JoliCode for reporting & Yonel Ceruto and Tobias Schultze for fixing the issue.
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