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CVE WatchNov 8, 2026

CVE-2026-123535

Tornado before 6.6 does not validate the max_age argument of RequestHandler.set_cookie (also called by set_signed_cookie, set_secure_cookie,

CVSS

4.2

Medium

EPSS

—

KEV

—

Exploit Today

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0-100

Published: Nov 8, 2026 · Last modified: Nov 8, 2026 · CWE-74

EPSS · 30d

Not enough EPSS history yet.

Technical description

Tornado before 6.6 does not validate the max_age argument of RequestHandler.set_cookie (also called by set_signed_cookie, set_secure_cookie, and clear_cookie), allowing injection of additional Set-Cookie attributes. When an application passes attacker-influenced input as max_age, an attacker can embed attributes such as Domain, Path, or Secure to widen the cookie's scope to parent paths or other subdomains.

Official references
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