Improper Neutralization of Special Elements in Output Used by a Downstream Component in Tornado - CVE-2026-35536
Published: April 27, 2026
Vulnerability identifier: #VU128148
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-35536
CWE-ID: CWE-74
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Tornado
Tornado
Software vendor:
Tornado
Tornado
Description
The vulnerability allows a remote attacker to inject attacker-controlled cookie attributes.
The vulnerability exists due to improper neutralization of special elements in output used by a downstream component in RequestHandler.set_cookie when processing the domain, path, and samesite arguments. A remote attacker can supply input containing semicolons to inject attacker-controlled cookie attributes.
User interaction is required for exploitation.
Remediation
Install security update from vendor's website.