Algorithmic Complexity Affecting jupyterhub-k8s-singleuser-sample package, versions <4.4.4-r3


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.38% (33rd percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-JUPYTERHUBK8SSINGLEUSERSAMPLE-21950697
  • published30 Oct 2026
  • disclosed26 Oct 2026

Introduced: 26 Oct 2026

NewCVE-2026-116577  (opens in a new tab)
CWE-407  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade Chainguard jupyterhub-k8s-singleuser-sample to version 4.4.4-r3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream jupyterhub-k8s-singleuser-sample package and not the jupyterhub-k8s-singleuser-sample package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1