SUSE-SU-2026:23571-1: moderate: Security update for python-aiohttp

[SLE-SECURITY-UPDATES]

# Security update for python-aiohttp

Announcement ID: SUSE-SU-2026:23571-1  
Release Date: 2026-08-30T14:38:11Z  
Rating: moderate  
References:

  * bsc#1273125
  * bsc#1273552
  * bsc#1273553

  
Cross-References:

  * CVE-2026-59881
  * CVE-2026-69243
  * CVE-2026-69244

  
CVSS scores:

  * CVE-2026-59881 ( SUSE ):  6.9
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-59881 ( SUSE ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-59881 ( NVD ):  6.9
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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-2026-69243 ( SUSE ):  6.3
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-69243 ( SUSE ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
  * CVE-2026-69243 ( NVD ):  6.3
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/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-2026-69244 ( SUSE ):  7.1
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-69244 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
  * CVE-2026-69244 ( NVD ):  7.1
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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

  
Affected Products:

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

  
  
An update that solves three vulnerabilities can now be installed.

## Description:

This update for python-aiohttp fixes the following issues:

  * CVE-2026-59881: excessive resource consumption due to WebSocket client
    accepting compressed frames without negotiated permessage-deflate
    (bsc#1273125).
  * CVE-2026-69243: HTTP request smuggling via the WebSocket upgrade procedure
    (bsc#1273553).
  * CVE-2026-69244: out-of-bounds heap read in the C response parser while
    building an error message for a malformed response (bsc#1273552).

## 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-16.0-1543

  * SUSE Linux Enterprise Server 16.0  
    zypper in -t patch SUSE-SLES-16.0-1543

## Package List:

  * SUSE Linux Enterprise Server for SAP applications 16.0 (ppc64le x86_64)
    * python-aiohttp-debugsource-3.11.16-160000.7.1
    * python313-aiohttp-debuginfo-3.11.16-160000.7.1
    * python313-aiohttp-3.11.16-160000.7.1
  * SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
    * python-aiohttp-debugsource-3.11.16-160000.7.1
    * python313-aiohttp-debuginfo-3.11.16-160000.7.1
    * python313-aiohttp-3.11.16-160000.7.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-59881.html
  * https://www.suse.com/security/cve/CVE-2026-69243.html
  * https://www.suse.com/security/cve/CVE-2026-69244.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1273125
  * https://bugzilla.suse.com/show_bug.cgi?id=1273552
  * https://bugzilla.suse.com/show_bug.cgi?id=1273553

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