Bug 2533964 (CVE-2026-91991) - CVE-2026-91991 tornado: Tornado: Cookie attribute injection via capitalized keyword arguments
Summary: CVE-2026-91991 tornado: Tornado: Cookie attribute injection via capitalized k...
Keywords:
Status: NEW
Alias: CVE-2026-91991
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2536873 2536874 2536875
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-15 15:52 UTC by OSIDB Bzimport
Modified: 2026-09-18 01:42 UTC (History)
49 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2026-09-15 15:52:15 UTC 
Tornado before 6.5.8 contains an incomplete fix for cookie attribute injection that allows attackers to inject arbitrary cookie attributes by passing capitalized or legacy keyword arguments to set_cookie. Attackers can embed semicolon-delimited data in capitalized parameters like Domain, Path, or SameSite to bypass validation and modify cookie security attributes.
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