Bug 2454716 (CVE-2026-35536)

Summary: CVE-2026-35536 tornado: Tornado: Cookie attribute injection due to improper handling of cookie arguments
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: anpicker, bbrownin, bparees, caswilli, ebourniv, hasun, jfula, jkoehler, jowilson, kaycoth, lgallett, lphiri, nyancey, ometelka, ptisnovs, rjohnson, sbunciak, syedriko, xdharmai
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in Tornado. A remote attacker could exploit this vulnerability by injecting specially crafted characters into the `domain`, `path`, and `samesite` arguments when setting cookies. This could lead to cookie attribute injection, potentially allowing for information disclosure or manipulation of client-side data.
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-04-03 04:01:14 UTC
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.