CVE-2026-35536

moderate-risk

Published 2026-04-03

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.

Do I need to act?

0.05% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.2/10 High

NETWORK / LOW complexity

Affected Products (1)

Tornado

Affected Vendors

Tornadoweb

References (2)

Product https://github.com/tornadoweb/tornado/releases/tag/v6.5.5

Vendor Advisory https://github.com/tornadoweb/tornado/security/advisories/GHSA-78cv-mqj4-43f7

/ 100

moderate-risk

Severity 26/34 · High

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal