CVE Watch31 de out. de 2026

CVE-2026-116577

Tornado is a Python web framework and asynchronous networking library. Prior to 6.6, Tornado's HTTP header parser accepts obsolete line fold

CVSS

5.3

Média

EPSS

0.4%

p33

KEV

—

Exploit Today

0-100

Publicado: 26 de out. de 2026 · Última mod.: 31 de out. de 2026 · CWE-407 · CWE-770

EPSS · 30d

0.4%EPSS · 30 dias0.4%

2026-10-272026-11-07

Descrição técnica

Tornado is a Python web framework and asynchronous networking library. Prior to 6.6, Tornado's HTTP header parser accepts obsolete line folding and repeatedly concatenates short continuation lines, causing quadratic CPU consumption on the IOLoop thread. An unauthenticated client can submit a header block containing many obsolete line-folding continuations before application code runs, blocking other connections served by the process. The cost grows with max_header_size, and only availability is affected. This issue is fixed in version 6.6.

Referências oficiais

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