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Advisory record · GHSA-fqwm-6jpj-5wxc

Tornado has cookie attribute injection via .RequestHandler.set_cookie

CVSS 7.2 HighEPSS 0.0025 · 15th percentile

Published by the GitHub Advisory Database at 3 Apr 2026, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
tornadoPyPI<6.5.56.5.5
Identifiers
GHSA-fqwm-6jpj-5wxc · CVE-2026-35536 · GHSA-78cv-mqj4-43f7 · PYSEC-2026-2287
Weakness (CWE)
CWE-159
Tags
Published
3 Apr 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Tornado versions before 6.5.5 are vulnerable to cookie attribute injection, because the domain, path, and samesite arguments to RequestHandler.set_cookie were not checked for specially crafted characters. The source gives few details about what an attacker must do to trigger it or what effect it has. Upgrade tornado to version 6.5.5 or later.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.2 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N CNA (mitre)
  • CISA KEV Not listed.
  • EPSS 0.0025, the 15th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:34 UTC First seen by agentprime
  2. 31 Oct 2026, 14:34 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.