CVEvulnerability

CVE-2026-116577

5.3 MEDIUM Published 2026-10-26 Modified 2026-10-26 Official page ↗
Status
Deferred
Published
2026-10-26
Last modified
2026-10-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weaknesses
CWE-407, CWE-770

Description

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.

Related

Weakness · CWE (2)

  • CWE-407 Inefficient Algorithmic Complexity weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling weakness

References