CVE-2026-35536
Tornado has cookie attribute injection via .RequestHandler.set_cookie
5.3
MEDIUM
CVSS 3.1
EPSS 0.24%
Description
In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path, and samesite arguments to .RequestHandler.set_cookie were not checked for crafted characters.
How to fix CVE-2026-35536
To remediate CVE-2026-35536, upgrade the affected package to a fixed version below.
- PyPI/tornado—upgrade to 6.5.5 or later
Is CVE-2026-35536 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 6.5.5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |