Bug 2533953 (CVE-2026-91990) - CVE-2026-91990 tornado: Tornado: Denial of Service via memory amplification in multipart parsing
Summary: CVE-2026-91990 tornado: Tornado: Denial of Service via memory amplification i...
Keywords:
Status: NEW
Alias: CVE-2026-91990
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2540168 2540169 2540170 2540194 2540195 2540196
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-15 15:52 UTC by OSIDB Bzimport
Modified: 2026-10-12 11:14 UTC (History)
49 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:80741 0 None None None 2026-10-12 11:14:49 UTC

Description OSIDB Bzimport 2026-09-15 15:52:12 UTC 
Tornado before 6.5.8 contains a memory amplification vulnerability in parse_multipart_form_data that splits multipart data before validating the max_parts limit. Attackers can send crafted multipart requests with many parts to create large transient lists, exhausting server memory and causing denial of service.
Comment 1 Jon Orris 2026-10-12 11:14:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:80741 https://access.redhat.com/errata/RHSA-2026:80741
Note You need to log in before you can comment on or make changes to this bug.