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CVE-2026-49854

Tornado: Out-of-bounds memory access in C extension PUBLISHED

Description (CNA)

Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, the optional native extension tornado.speedups implemented websocket_mask without validating that the mask argument is exactly four bytes, allowing the C function to read up to three bytes beyond the provided buffer when reached through Tornado XSRF token decoding with the native extension active. This issue is fixed in version 6.5.6.

Affected (CNA)

Vendor / productVersions
tornadoweb / tornadoaffected < 6.5.6

CWE

CWE-126

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.