SUSE alert openSUSE-SU-2026:21372-1 (python-aiohttp)

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null@suse.de
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openSUSE-SU-2026:21372-1: important: Security update for python-aiohttp
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Tue, 21 Jul 2026 17:52:08 +0200
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<20260721155208.0E735FCE8@maintenance.suse.de>
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Article
openSUSE security update: security update for python-aiohttp
-------------------------------------------------------------

Announcement ID: openSUSE-SU-2026:21372-1
Rating: important
References:

  * bsc#1268398
  * bsc#1268543
  * bsc#1268544
  * bsc#1268549
  * bsc#1268556
  * bsc#1268559
  * bsc#1268560
  * bsc#1268561



Cross-References:

  * CVE-2026-50269
  * CVE-2026-54273
  * CVE-2026-54274
  * CVE-2026-54275
  * CVE-2026-54277
  * CVE-2026-54278
  * CVE-2026-54279
  * CVE-2026-54280



CVSS scores:

  * CVE-2026-50269 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
  * CVE-2026-54273 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-54274 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-54274 ( SUSE ): 6.6
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:U
  * CVE-2026-54275 ( SUSE ): 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
  * CVE-2026-54277 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-54278 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-54278 ( SUSE ): 8.2 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-54279 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
  * CVE-2026-54280 ( SUSE ): 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

Affected Products:

         openSUSE Leap 16.0

-------------------------------------------------------------

An update that solves 8 vulnerabilities and has 8 bug fixes can now be installed.

Description:

This update for python-aiohttp fixes the following issues

- CVE-2026-50269: improper validation of user-controlled strings allows for CRLF injection in
multipart headers
  (bsc#1268398).
- CVE-2026-54273: no limit in the HTTP/1 pipelined request queue can lead to excessive resource
consumption
  (bsc#1268543).
- CVE-2026-54274: incomplete websocket frame payloads can bypass memory use limits and cause a DoS
via excessive
  resource consumption (bsc#1268544).
- CVE-2026-54275: `server_hostname` TLS SNI check bypass when an existing connection is reused
(bsc#1268549).
- CVE-2026-54277: `max_line_size` bypass when using the optimised C HTTP parser can lead to
excessive resource
  consumption (bsc#1268556).
- CVE-2026-54278: unread compressed request bodies can bypass `client_max_size` during cleanup and
cause a DoS
  (bsc#1268559).
- CVE-2026-54279: host-only cookies become domain cookies after `CookieJar` persistence
(bsc#1268560).
- CVE-2026-54280: payload resources are not closed correctly when a client disconnects in the
middle of a write and
  can cause resource starvation (bsc#1268561).


Patch instructions:

   To install this openSUSE security 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 16.0

   zypper in -t patch openSUSE-Leap-16.0-1281=1

Package List:

- openSUSE Leap 16.0:

  python313-aiohttp-3.11.16-160000.6.1

References:

  * https://www.suse.com/security/cve/CVE-2026-50269.html
  * https://www.suse.com/security/cve/CVE-2026-54273.html
  * https://www.suse.com/security/cve/CVE-2026-54274.html
  * https://www.suse.com/security/cve/CVE-2026-54275.html
  * https://www.suse.com/security/cve/CVE-2026-54277.html
  * https://www.suse.com/security/cve/CVE-2026-54278.html
  * https://www.suse.com/security/cve/CVE-2026-54279.html
  * https://www.suse.com/security/cve/CVE-2026-54280.html