SUSE-SU-2026:3291-1: important: Security update for python-tornado

[SLE-UPDATES]

# Security update for python-tornado

Announcement ID: SUSE-SU-2026:3291-1  
Release Date: 2026-07-27T15:15:54Z  
Rating: important  
References:

  * bsc#1268395
  * bsc#1268396
  * bsc#1268397

  
Cross-References:

  * CVE-2026-49853
  * CVE-2026-49854
  * CVE-2026-49855

  
CVSS scores:

  * CVE-2026-49853 ( SUSE ):  7.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
  * CVE-2026-49853 ( NVD ):  7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
  * CVE-2026-49854 ( SUSE ):  3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
  * CVE-2026-49854 ( NVD ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
  * CVE-2026-49855 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-49855 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

  
Affected Products:

  * SUSE Linux Enterprise Desktop 12
  * SUSE Linux Enterprise Desktop 12 SP1
  * SUSE Linux Enterprise Desktop 12 SP2
  * SUSE Linux Enterprise Desktop 12 SP3
  * SUSE Linux Enterprise Desktop 12 SP4
  * SUSE Linux Enterprise High Performance Computing 12 SP2
  * SUSE Linux Enterprise High Performance Computing 12 SP3
  * SUSE Linux Enterprise High Performance Computing 12 SP4
  * SUSE Linux Enterprise High Performance Computing 12 SP5
  * SUSE Linux Enterprise Server 12
  * SUSE Linux Enterprise Server 12 SP1
  * SUSE Linux Enterprise Server 12 SP2
  * SUSE Linux Enterprise Server 12 SP3
  * SUSE Linux Enterprise Server 12 SP4
  * SUSE Linux Enterprise Server 12 SP5
  * SUSE Linux Enterprise Server for SAP Applications 12
  * SUSE Linux Enterprise Server for SAP Applications 12 SP1
  * SUSE Linux Enterprise Server for SAP Applications 12 SP2
  * SUSE Linux Enterprise Server for SAP Applications 12 SP3
  * SUSE Linux Enterprise Server for SAP Applications 12 SP4
  * SUSE Linux Enterprise Server for SAP Applications 12 SP5
  * SUSE Linux Enterprise Server for the Raspberry Pi 12-SP2
  * SUSE Manager Client Tools for SLE 12

  
  
An update that solves three vulnerabilities can now be installed.

## Description:

This update for python-tornado fixes the following issues

  * CVE-2026-49853: authorization header forwarded across cross-origin redirects
    in SimpleAsyncHTTPClient (bsc#1268395).
  * CVE-2026-49854: out-of-bounds memory access via C extension (bsc#1268396).
  * CVE-2026-49855: AsyncHTTPClient accumulates decompressed chunks without size
    limit (bsc#1268397).

## 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 Manager Client Tools for SLE 12  
    zypper in -t patch SUSE-SLE-Manager-Tools-12-2026-3291=1

## Package List:

  * SUSE Manager Client Tools for SLE 12 (aarch64 ppc64le s390x x86_64)
    * python-tornado-debugsource-4.2.1-17.21.1
    * python-tornado-debuginfo-4.2.1-17.21.1
    * python-tornado-4.2.1-17.21.1
    * python3-tornado-4.2.1-17.21.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-49853.html
  * https://www.suse.com/security/cve/CVE-2026-49854.html
  * https://www.suse.com/security/cve/CVE-2026-49855.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1268395
  * https://bugzilla.suse.com/show_bug.cgi?id=1268396
  * https://bugzilla.suse.com/show_bug.cgi?id=1268397

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