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, rhel-process-autobot, rjohnson, sbunciak, syedriko, watson-tool-maintainers, 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:
Bug Depends On: 2457334, 2457335    
Bug Blocks:    

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.

Comment 3 errata-xmlrpc 2026-05-05 09:18:19 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:13641 https://access.redhat.com/errata/RHSA-2026:13641

Comment 4 errata-xmlrpc 2026-05-05 10:23:28 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:13670 https://access.redhat.com/errata/RHSA-2026:13670

Comment 5 errata-xmlrpc 2026-05-19 13:03:39 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:19034 https://access.redhat.com/errata/RHSA-2026:19034

Comment 6 errata-xmlrpc 2026-05-19 18:00:39 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:19189 https://access.redhat.com/errata/RHSA-2026:19189

Comment 7 errata-xmlrpc 2026-05-26 02:55:22 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:20573 https://access.redhat.com/errata/RHSA-2026:20573

Comment 8 errata-xmlrpc 2026-05-26 03:17:57 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:20577 https://access.redhat.com/errata/RHSA-2026:20577

Comment 9 errata-xmlrpc 2026-05-26 03:46:45 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:20572 https://access.redhat.com/errata/RHSA-2026:20572

Comment 10 errata-xmlrpc 2026-05-26 11:09:57 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:20810 https://access.redhat.com/errata/RHSA-2026:20810

Comment 11 errata-xmlrpc 2026-06-08 01:40:14 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:24342 https://access.redhat.com/errata/RHSA-2026:24342