<div class="container">
<h1>Security update for python-aiohttp</h1>
<table class="table table-striped table-bordered">
<tbody>
<tr>
<th>Announcement ID:</th>
<td>SUSE-SU-2026:22819-1</td>
</tr>
<tr>
<th>Release Date:</th>
<td>2026-07-18T09:46:55Z</td>
</tr>
<tr>
<th>Rating:</th>
<td>important</td>
</tr>
<tr>
<th>References:</th>
<td>
<ul>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268398">bsc#1268398</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268543">bsc#1268543</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268544">bsc#1268544</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268549">bsc#1268549</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268556">bsc#1268556</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268559">bsc#1268559</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268560">bsc#1268560</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268561">bsc#1268561</a>
</li>
</ul>
</td>
</tr>
<tr>
<th>
Cross-References:
</th>
<td>
<ul>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-50269.html">CVE-2026-50269</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-54273.html">CVE-2026-54273</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-54274.html">CVE-2026-54274</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-54275.html">CVE-2026-54275</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-54277.html">CVE-2026-54277</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-54278.html">CVE-2026-54278</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-54279.html">CVE-2026-54279</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-54280.html">CVE-2026-54280</a>
</li>
</ul>
</td>
</tr>
<tr>
<th>CVSS scores:</th>
<td>
<ul class="list-group">
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-50269</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">5.9</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-50269</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">2.7</span>
<span class="cvss-vector">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/E:U/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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-50269</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">7.5</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54273</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">7.5</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54273</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">6.6</span>
<span class="cvss-vector">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/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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54273</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">7.5</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54274</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">6.6</span>
<span class="cvss-vector">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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54274</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">7.5</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54274</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">6.6</span>
<span class="cvss-vector">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/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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54274</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">7.5</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54275</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">4.8</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54275</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">2.7</span>
<span class="cvss-vector">CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54275</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">7.5</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54277</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">7.5</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54277</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">6.6</span>
<span class="cvss-vector">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/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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54277</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">7.5</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54278</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">8.2</span>
<span class="cvss-vector">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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54278</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">5.9</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54278</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">6.6</span>
<span class="cvss-vector">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/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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54278</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">7.5</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54279</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">5.3</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54279</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">1.3</span>
<span class="cvss-vector">CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54279</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">7.5</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54280</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">3.1</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54280</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">1.7</span>
<span class="cvss-vector">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/E:U/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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-54280</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">7.5</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H</span>
</li>
</ul>
</td>
</tr>
<tr>
<th>Affected Products:</th>
<td>
<ul class="list-group">
<li class="list-group-item">SUSE Linux Enterprise Server 16.0</li>
<li class="list-group-item">SUSE Linux Enterprise Server for SAP applications 16.0</li>
</ul>
</td>
</tr>
</tbody>
</table>
<p>An update that solves eight vulnerabilities can now be installed.</p>
<h2>Description:</h2>
<p>This update for python-aiohttp fixes the following issues</p>
<ul>
<li>CVE-2026-50269: improper validation of user-controlled strings allows for CRLF injection in multipart headers
(bsc#1268398).</li>
<li>CVE-2026-54273: no limit in the HTTP/1 pipelined request queue can lead to excessive resource consumption
(bsc#1268543).</li>
<li>CVE-2026-54274: incomplete websocket frame payloads can bypass memory use limits and cause a DoS via excessive
resource consumption (bsc#1268544).</li>
<li>CVE-2026-54275: <code>server_hostname</code> TLS SNI check bypass when an existing connection is reused (bsc#1268549).</li>
<li>CVE-2026-54277: <code>max_line_size</code> bypass when using the optimised C HTTP parser can lead to excessive resource
consumption (bsc#1268556).</li>
<li>CVE-2026-54278: unread compressed request bodies can bypass <code>client_max_size</code> during cleanup and cause a DoS
(bsc#1268559).</li>
<li>CVE-2026-54279: host-only cookies become domain cookies after <code>CookieJar</code> persistence (bsc#1268560).</li>
<li>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).</li>
</ul>
<h2>Patch Instructions:</h2>
<p>
To install this SUSE update use the SUSE recommended
installation methods like YaST online_update or "zypper patch".<br/>
Alternatively you can run the command listed for your product:
</p>
<ul class="list-group">
<li class="list-group-item">
SUSE Linux Enterprise Server for SAP applications 16.0
<br/>
<code>zypper in -t patch SUSE-SLES-16.0-1281=1</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Server 16.0
<br/>
<code>zypper in -t patch SUSE-SLES-16.0-1281=1</code>
</li>
</ul>
<h2>Package List:</h2>
<ul>
<li>
SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
<ul>
<li>python313-aiohttp-3.11.16-160000.6.1</li>
<li>python-aiohttp-debugsource-3.11.16-160000.6.1</li>
<li>python313-aiohttp-debuginfo-3.11.16-160000.6.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Server for SAP applications 16.0 (ppc64le x86_64)
<ul>
<li>python313-aiohttp-3.11.16-160000.6.1</li>
<li>python-aiohttp-debugsource-3.11.16-160000.6.1</li>
<li>python313-aiohttp-debuginfo-3.11.16-160000.6.1</li>
</ul>
</li>
</ul>
<h2>References:</h2>
<ul>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-50269.html">https://www.suse.com/security/cve/CVE-2026-50269.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-54273.html">https://www.suse.com/security/cve/CVE-2026-54273.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-54274.html">https://www.suse.com/security/cve/CVE-2026-54274.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-54275.html">https://www.suse.com/security/cve/CVE-2026-54275.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-54277.html">https://www.suse.com/security/cve/CVE-2026-54277.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-54278.html">https://www.suse.com/security/cve/CVE-2026-54278.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-54279.html">https://www.suse.com/security/cve/CVE-2026-54279.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-54280.html">https://www.suse.com/security/cve/CVE-2026-54280.html</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268398">https://bugzilla.suse.com/show_bug.cgi?id=1268398</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268543">https://bugzilla.suse.com/show_bug.cgi?id=1268543</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268544">https://bugzilla.suse.com/show_bug.cgi?id=1268544</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268549">https://bugzilla.suse.com/show_bug.cgi?id=1268549</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268556">https://bugzilla.suse.com/show_bug.cgi?id=1268556</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268559">https://bugzilla.suse.com/show_bug.cgi?id=1268559</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268560">https://bugzilla.suse.com/show_bug.cgi?id=1268560</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1268561">https://bugzilla.suse.com/show_bug.cgi?id=1268561</a>
</li>
</ul>
</div>