| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 91.0.1 | 91.0.1 |
| thunderbird | < 91.0.1 | 91.0.1 |
Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers. This allowed for a header splitting attack against servers using HTTP/3. This vulnerability affects Firefox < 91.0.1 and Thunderbird < 91.0.1.
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