| Package | Affected versions | Patched versions |
|---|---|---|
| tornado | < 6.4.2 | 6.4.2 |
| tornado | < 6.4.2 | 6.4.2 |
The algorithm used for parsing HTTP cookies in Tornado versions prior to 6.4.2 sometimes has quadratic complexity, leading to excessive CPU consumption when parsing maliciously-crafted cookie headers. This parsing occurs in the event loop thread and may block the processing of other requests.
See also CVE-2024-7592 for a similar vulnerability in cpython.
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