Bug 2446765 (CVE-2026-31958) - CVE-2026-31958 tornado-python: Tornado: Denial of Service via large multipart bodies
Summary: CVE-2026-31958 tornado-python: Tornado: Denial of Service via large multipart...
Keywords:
Status: NEW
Alias: CVE-2026-31958
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2446769 2446779 2446787 2451656 2451657 2451658 2451659 2451660
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-11 20:02 UTC by OSIDB Bzimport
Modified: 2026-05-05 10:23 UTC (History)
22 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-2026:11454 0 None None None 2026-04-29 05:25:40 UTC
Red Hat Product Errata RHSA-2026:11493 0 None None None 2026-04-29 06:15:17 UTC
Red Hat Product Errata RHSA-2026:11494 0 None None None 2026-04-29 05:55:23 UTC
Red Hat Product Errata RHSA-2026:11495 0 None None None 2026-04-29 05:56:54 UTC
Red Hat Product Errata RHSA-2026:13641 0 None None None 2026-05-05 09:18:22 UTC
Red Hat Product Errata RHSA-2026:13670 0 None None None 2026-05-05 10:23:31 UTC
Red Hat Product Errata RHSA-2026:8093 0 None None None 2026-04-14 15:25:44 UTC

Description OSIDB Bzimport 2026-03-11 20:02:23 UTC 
Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to 6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting (default 100MB). Since parsing occurs synchronously on the main thread, this creates the possibility of denial-of-service due to the cost of parsing very large multipart bodies with many parts. This vulnerability is fixed in 6.5.5.
Comment 3 errata-xmlrpc 2026-04-14 15:25:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:8093 https://access.redhat.com/errata/RHSA-2026:8093
Comment 4 errata-xmlrpc 2026-04-29 05:25:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:11454 https://access.redhat.com/errata/RHSA-2026:11454
Comment 5 errata-xmlrpc 2026-04-29 05:55:21 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2026:11494 https://access.redhat.com/errata/RHSA-2026:11494
Comment 6 errata-xmlrpc 2026-04-29 05:56:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:11495 https://access.redhat.com/errata/RHSA-2026:11495
Comment 7 errata-xmlrpc 2026-04-29 06:15:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:11493 https://access.redhat.com/errata/RHSA-2026:11493
Comment 8 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 9 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
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