SUSE-SU-2026:0849-1: moderate: Security update for python-Flask

[SLE-SECURITY-UPDATES]

# Security update for python-Flask

Announcement ID: SUSE-SU-2026:0849-1  
Release Date: 2026-03-09T10:13:48Z  
Rating: moderate  
References:

  * bsc#1258700

  
Cross-References:

  * CVE-2026-27205

  
CVSS scores:

  * CVE-2026-27205 ( SUSE ):  6.0
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-27205 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
  * CVE-2026-27205 ( NVD ):  2.3
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/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-2026-27205 ( NVD ):  4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

  
Affected Products:

  * openSUSE Leap 15.4
  * openSUSE Leap 15.6
  * Python 3 Module 15-SP7
  * SUSE Linux Enterprise Desktop 15 SP7
  * SUSE Linux Enterprise Server 15 SP7
  * SUSE Linux Enterprise Server for SAP Applications 15 SP7

  
  
An update that solves one vulnerability can now be installed.

## Description:

This update for python-Flask fixes the following issue:

  * CVE-2026-27205: information disclosure due to Flask session not adding the
    `Vary: Cookie` header (bsc#1258700).

## 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:

  * openSUSE Leap 15.4  
    zypper in -t patch SUSE-2026-849=1

  * openSUSE Leap 15.6  
    zypper in -t patch openSUSE-SLE-15.6-2026-849=1

  * Python 3 Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Python3-15-SP7-2026-849=1

## Package List:

  * openSUSE Leap 15.4 (noarch)
    * python311-Flask-2.3.2-150400.3.9.1
    * python311-Flask-doc-2.3.2-150400.3.9.1
  * openSUSE Leap 15.6 (noarch)
    * python311-Flask-2.3.2-150400.3.9.1
    * python311-Flask-doc-2.3.2-150400.3.9.1
  * Python 3 Module 15-SP7 (noarch)
    * python311-Flask-2.3.2-150400.3.9.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-27205.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1258700

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