SUSE-SU-2026:24207-1: important: Security update for python-tornado6

[SLE-SECURITY-UPDATES]

# Security update for python-tornado6

Announcement ID: SUSE-SU-2026:24207-1  
Release Date: 2026-10-08T10:42:17Z  
Rating: important  
References:

  * bsc#1261922
  * bsc#1277725
  * bsc#1281439
  * bsc#1281440

  
Cross-References:

  * CVE-2026-82397
  * CVE-2026-91990
  * CVE-2026-91991

  
CVSS scores:

  * CVE-2026-82397 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-82397 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-91990 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-91990 ( NVD ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-91990 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-91991 ( SUSE ):  7.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
  * CVE-2026-91991 ( NVD ):  6.3
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-91991 ( NVD ):  5.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

  
Affected Products:

  * SUSE Linux Enterprise Server 16.0
  * SUSE Linux Enterprise Server for SAP applications 16.0

  
  
An update that solves three vulnerabilities and has one fix can now be
installed.

## Description:

This update for python-tornado6 fixes the following issues:

  * CVE-2026-82397: an unauthenticated request body containing millions of
    separator-delimited fields can synchronously stall the single-threaded event
    loop and delay every connection (bsc#1277725).
  * CVE-2026-91990: splitting of multipart data before validation of the
    `max_parts` limit allows for resource exhaustion and a denial of service
    (bsc#1281439).
  * CVE-2026-91991: incomplete fix for cookie attribute injection allows for
    cookie validation bypass via semicolon- delimited data in capitalized
    parameters (bsc#1281440).

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * SUSE Linux Enterprise Server for SAP applications 16.0  
    zypper in -t patch SUSE-SLES-16.0-1872

  * SUSE Linux Enterprise Server 16.0  
    zypper in -t patch SUSE-SLES-16.0-1872

## Package List:

  * SUSE Linux Enterprise Server for SAP applications 16.0 (ppc64le x86_64)
    * python313-tornado6-debuginfo-6.5-160000.7.1
    * python313-tornado6-6.5-160000.7.1
    * python-tornado6-debugsource-6.5-160000.7.1
  * SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
    * python313-tornado6-debuginfo-6.5-160000.7.1
    * python313-tornado6-6.5-160000.7.1
    * python-tornado6-debugsource-6.5-160000.7.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-82397.html
  * https://www.suse.com/security/cve/CVE-2026-91990.html
  * https://www.suse.com/security/cve/CVE-2026-91991.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1261922
  * https://bugzilla.suse.com/show_bug.cgi?id=1277725
  * https://bugzilla.suse.com/show_bug.cgi?id=1281439
  * https://bugzilla.suse.com/show_bug.cgi?id=1281440

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