Bug 2446765 (CVE-2026-31958)

Summary: CVE-2026-31958 tornado-python: Tornado: Denial of Service via large multipart bodies
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, jmitchel, jowilson, kaycoth, kshier, lgallett, lphiri, nyancey, ometelka, pbohmill, ptisnovs, sbunciak, syedriko, teagle, 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-python. A remote attacker can exploit this vulnerability by sending a specially crafted, very large multipart body with numerous parts. Because the parsing of these large bodies occurs synchronously on the main thread, it can consume excessive resources, leading to a denial of service (DoS) for the application.
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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: 2446769, 2446779, 2446787, 2451656, 2451657, 2451658, 2451659, 2451660    
Bug Blocks:    

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

Comment 10 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 11 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 12 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 13 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 14 errata-xmlrpc 2026-05-26 03:46:43 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 15 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 16 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