SUSE alert openSUSE-SU-2026:21098-1 (python-aiohttp)

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openSUSE-SU-2026:21098-1: important: Security update for python-aiohttp
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Tue, 30 Jun 2026 09:48:20 +0200
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<20260630074820.DDAC2FF48@maintenance.suse.de>
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Article
openSUSE security update: security update for python-aiohttp
-------------------------------------------------------------

Announcement ID: openSUSE-SU-2026:21098-1
Rating: important
References:

  * bsc#1261320
  * bsc#1261321
  * bsc#1261322
  * bsc#1261329
  * bsc#1261331
  * bsc#1261332
  * bsc#1261334
  * bsc#1261335
  * bsc#1261343
  * bsc#1267471
  * bsc#1267561



Cross-References:

  * CVE-2026-22815
  * CVE-2026-34513
  * CVE-2026-34514
  * CVE-2026-34516
  * CVE-2026-34517
  * CVE-2026-34518
  * CVE-2026-34519
  * CVE-2026-34520
  * CVE-2026-34525
  * CVE-2026-34993
  * CVE-2026-47265



CVSS scores:

  * CVE-2026-22815 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-22815 ( 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-2026-34513 ( SUSE ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-34513 ( SUSE ): 6.3 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-34514 ( SUSE ): 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
  * CVE-2026-34514 ( SUSE ): 6.3 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-34516 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-34516 ( 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-2026-34517 ( SUSE ): 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
  * CVE-2026-34517 ( SUSE ): 2.3 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-34518 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
  * CVE-2026-34518 ( SUSE ): 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-34519 ( SUSE ): 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
  * CVE-2026-34519 ( 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-2026-34520 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
  * CVE-2026-34520 ( SUSE ): 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-34525 ( SUSE ): 5.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
  * CVE-2026-34525 ( SUSE ): 6.3 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N
  * CVE-2026-34993 ( SUSE ): 7 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-47265 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected Products:

         openSUSE Leap 16.0

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

An update that solves 11 vulnerabilities and has 11 bug fixes can now be installed.

Description:

This update for python-aiohttp fixes the following issues

- CVE-2026-22815: insufficient header/trailer handling can cause a denial of service
(bsc#1261320).
- CVE-2026-34513: unbounded DNS cache can cause a denial of service (bsc#1261321).
- CVE-2026-34514: content_type parameter manipulation can lead to header Injection (bsc#1261322).
- CVE-2026-34516: excessive multipart headers can cause a denial of service (bsc#1261329).
- CVE-2026-34517: large multipart form fields can cause a denial of service (bsc#1261331).
- CVE-2026-34518: retained Cookie and Proxy-Authorization headers during redirects can lead to
information disclosure
  (bsc#1261332).
- CVE-2026-34519: reason parameter can be use to perform header injection (bsc#1261334).
- CVE-2026-34520: improper character handling can lead to header injection (bsc#1261335).
- CVE-2026-34525: multiple Host headers can potentially lead to security bypass (bsc#1261343).
- CVE-2026-34993: arbitrary code execution via loading untrusted input in CookieJar.load()
(bsc#1267471).
- CVE-2026-47265: cookies set with the `cookies` parameter on requests are sent after following a
cross-origin redirect
  (bsc#1267561).


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-16.0-963=1

Package List:

- openSUSE Leap 16.0:

  python313-aiohttp-3.11.16-160000.5.1

References:

  * https://www.suse.com/security/cve/CVE-2026-22815.html
  * https://www.suse.com/security/cve/CVE-2026-34513.html
  * https://www.suse.com/security/cve/CVE-2026-34514.html
  * https://www.suse.com/security/cve/CVE-2026-34516.html
  * https://www.suse.com/security/cve/CVE-2026-34517.html
  * https://www.suse.com/security/cve/CVE-2026-34518.html
  * https://www.suse.com/security/cve/CVE-2026-34519.html
  * https://www.suse.com/security/cve/CVE-2026-34520.html
  * https://www.suse.com/security/cve/CVE-2026-34525.html
  * https://www.suse.com/security/cve/CVE-2026-34993.html
  * https://www.suse.com/security/cve/CVE-2026-47265.html