Threats Tagged 'brew-snakeviz-cve-2026-49854'
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Threats Tagged 'brew-snakeviz-cve-2026-49854'
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### Summary Tornado's optional native extension `tornado.speedups` implements `websocket_mask` without validating that the `mask` argument is exactly four bytes long. The C function reads four bytes from `mask` unconditionally, even when Python passes a shorter byte string. This can read beyond the provided buffer, exposing up to 3 bytes of uninitialized memory. The behavior is reachable from Tornado's XSRF token decoder when `xsrf_cookies=True` and the native extension is active. ### Mitigations This bug is fixed in Tornado 6.5.6. Prior to upgrading to this version, setting the environment variable TORNADO_EXTENSION=0 will disable the vulnerable code (at the expense of reducing websocket performance). Join the discussion | CVE Database V5 | 08/13/2026, 17:34:42 UTC Added: 07/14/2026, 20:48:06 UTC |
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