<div class="container">
<h1>Security update for cpp-httplib</h1>
<table class="table table-striped table-bordered">
<tbody>
<tr>
<th>Announcement ID:</th>
<td>SUSE-SU-2026:21599-1</td>
</tr>
<tr>
<th>Release Date:</th>
<td>2026-05-08T10:00:52Z</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=1255835">bsc#1255835</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1256518">bsc#1256518</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1259220">bsc#1259220</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1259221">bsc#1259221</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1259373">bsc#1259373</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-2026-21428.html">CVE-2026-21428</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-22776.html">CVE-2026-22776</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-28434.html">CVE-2026-28434</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-28435.html">CVE-2026-28435</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-29076.html">CVE-2026-29076</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-2026-21428</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">8.7</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-21428</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">7.7</span>
<span class="cvss-vector">CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/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-2026-21428</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:H/A:N</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-22776</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">7.1</span>
<span class="cvss-vector">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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-22776</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">6.5</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-22776</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">8.7</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: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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-22776</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-2026-28434</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">6.9</span>
<span class="cvss-vector">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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-28434</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-2026-28434</span>
<span class="cvss-source">
(
NVD
):
</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-2026-28435</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">8.7</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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-28435</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-2026-28435</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-2026-29076</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">8.2</span>
<span class="cvss-vector">CVSS:4.0/AV:N/AC:L/AT:P/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-2026-29076</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-2026-29076</span>
<span class="cvss-source">
(
NVD
):
</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>
</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 five vulnerabilities can now be installed.</p>
<h2>Description:</h2>
<p>This update for cpp-httplib fixes the following issues</p>
<ul>
<li>CVE-2026-21428: server-side request forgery via header injection (bsc#1255835).</li>
<li>CVE-2026-22776: unsafe handling of compressed HTTP request can cause a denial of service (bsc#1256518).</li>
<li>CVE-2026-28434: default exception handler may leak e.what() to clients via EXCEPTION_WHAT response header
(bsc#1259221).</li>
<li>CVE-2026-28435: payload size limit bypass via gzip decompression in ContentReader (streaming) can lead to denial of
service (bsc#1259220).</li>
<li>CVE-2026-29076: denial of service via crafted HTTP POST request (bsc#1259373).</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 16.0
<br/>
<code>zypper in -t patch SUSE-SLES-16.0-724=1</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Server for SAP applications 16.0
<br/>
<code>zypper in -t patch SUSE-SLES-16.0-724=1</code>
</li>
</ul>
<h2>Package List:</h2>
<ul>
<li>
SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
<ul>
<li>libcpp-httplib0_22-debuginfo-0.22.0-160000.5.1</li>
<li>cpp-httplib-debugsource-0.22.0-160000.5.1</li>
<li>libcpp-httplib0_22-0.22.0-160000.5.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Server for SAP applications 16.0 (ppc64le x86_64)
<ul>
<li>libcpp-httplib0_22-debuginfo-0.22.0-160000.5.1</li>
<li>cpp-httplib-debugsource-0.22.0-160000.5.1</li>
<li>libcpp-httplib0_22-0.22.0-160000.5.1</li>
</ul>
</li>
</ul>
<h2>References:</h2>
<ul>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-21428.html">https://www.suse.com/security/cve/CVE-2026-21428.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-22776.html">https://www.suse.com/security/cve/CVE-2026-22776.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-28434.html">https://www.suse.com/security/cve/CVE-2026-28434.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-28435.html">https://www.suse.com/security/cve/CVE-2026-28435.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-29076.html">https://www.suse.com/security/cve/CVE-2026-29076.html</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1255835">https://bugzilla.suse.com/show_bug.cgi?id=1255835</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1256518">https://bugzilla.suse.com/show_bug.cgi?id=1256518</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1259220">https://bugzilla.suse.com/show_bug.cgi?id=1259220</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1259221">https://bugzilla.suse.com/show_bug.cgi?id=1259221</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1259373">https://bugzilla.suse.com/show_bug.cgi?id=1259373</a>
</li>
</ul>
</div>