<div class="container">
<h1>Security update for cosign</h1>
<table class="table table-striped table-bordered">
<tbody>
<tr>
<th>Announcement ID:</th>
<td>SUSE-SU-2026:4392-1</td>
</tr>
<tr>
<th>Release Date:</th>
<td>2026-09-29T11:49:18Z</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=1272117">bsc#1272117</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1275025">bsc#1275025</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1278614">bsc#1278614</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1279215">bsc#1279215</a>
</li>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1282542">bsc#1282542</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-2026-56852.html">CVE-2026-56852</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-56854.html">CVE-2026-56854</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-56855.html">CVE-2026-56855</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-56864.html">CVE-2026-56864</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-78662.html">CVE-2026-78662</a>
</li>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2026-84304.html">CVE-2026-84304</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-2026-56852</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">6.0</span>
<span class="cvss-vector">CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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-2026-56852</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-2026-56852</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-2026-56854</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">8.6</span>
<span class="cvss-vector">CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-56854</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">8.1</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-56854</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:H/I:N/A:N</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-56855</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-2026-56855</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-2026-56855</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-2026-56864</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">5.3</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-56864</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:H/I:N/A:N</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-78662</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-2026-78662</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:H/I:N/A:N</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-78662</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:H/I:N/A:N</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2026-84304</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-2026-84304</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-2026-84304</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>
</ul>
</td>
</tr>
<tr>
<th>Affected Products:</th>
<td>
<ul class="list-group">
<li class="list-group-item">Basesystem Module 15-SP7</li>
<li class="list-group-item">openSUSE Leap 15.4</li>
<li class="list-group-item">SUSE Linux Enterprise Desktop 15 SP7</li>
<li class="list-group-item">SUSE Linux Enterprise High Performance Computing 15 SP4</li>
<li class="list-group-item">SUSE Linux Enterprise High Performance Computing 15 SP5</li>
<li class="list-group-item">SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4</li>
<li class="list-group-item">SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5</li>
<li class="list-group-item">SUSE Linux Enterprise High Performance Computing LTSS 15 SP4</li>
<li class="list-group-item">SUSE Linux Enterprise High Performance Computing LTSS 15 SP5</li>
<li class="list-group-item">SUSE Linux Enterprise Real Time 15 SP7</li>
<li class="list-group-item">SUSE Linux Enterprise Server 15 SP4</li>
<li class="list-group-item">SUSE Linux Enterprise Server 15 SP4 LTSS</li>
<li class="list-group-item">SUSE Linux Enterprise Server 15 SP5</li>
<li class="list-group-item">SUSE Linux Enterprise Server 15 SP5 LTSS</li>
<li class="list-group-item">SUSE Linux Enterprise Server 15 SP6</li>
<li class="list-group-item">SUSE Linux Enterprise Server 15 SP6 LTSS</li>
<li class="list-group-item">SUSE Linux Enterprise Server 15 SP7</li>
<li class="list-group-item">SUSE Linux Enterprise Server for SAP Applications 15 SP4</li>
<li class="list-group-item">SUSE Linux Enterprise Server for SAP Applications 15 SP5</li>
<li class="list-group-item">SUSE Linux Enterprise Server for SAP Applications 15 SP6</li>
<li class="list-group-item">SUSE Linux Enterprise Server for SAP Applications 15 SP7</li>
</ul>
</td>
</tr>
</tbody>
</table>
<p>An update that solves six vulnerabilities can now be installed.</p>
<h2>Description:</h2>
<p>This update for cosign fixes the following issues:</p>
<ul>
<li>CVE-2026-56852: golang.org/x/text/unicode/norm: infinite loop on truncated/invalid UTF-8 input (bsc#1272117).</li>
<li>CVE-2026-56854,CVE-2026-56855,CVE-2026-78662: golang.org/x/crypto/ssh: authentication bypass and deadlocks in the
crypto/ssh library (bsc#1278614).</li>
<li>CVE-2026-56864: x/mod/sumdb: ignore unrelated, unauthenticated hashes in Lookup (bsc#1275025).</li>
<li>CVE-2026-84304: google.golang.org/grpc: heap memory exhaustion via HTTP/2 DATA frame fragmentation (bsc#1279215).</li>
<li>Verification bypass via public key in legacy bundle (bsc#1282542).</li>
</ul>
<p>Changes for cosign:</p>
<ul>
<li>update to 3.1.3:</li>
<li>Auto-detect default digest algorithm for public keys</li>
<li>fix(pkcs11key): return an error instead of panicking when no
key pair matches</li>
<li>Supporting OCI Signing with X.509 Certificate Chain</li>
<li>fix: prevent shell completions for various options not taking
filenames</li>
<li>fix(blob): compare file checksums case-insensitively in</li>
<li>Verification bypass via public key in legacy bundle (GHSA-
fx35-mq7g-6g98, bsc#1282542)</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 15 SP4
<br/>
<code>zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP4-2026-4392</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4
<br/>
<code>zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-ESPOS-2026-4392</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise High Performance Computing LTSS 15 SP4
<br/>
<code>zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-LTSS-2026-4392</code>
</li>
<li class="list-group-item">
openSUSE Leap 15.4
<br/>
<code>zypper in -t patch SUSE-2026-4392</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Server for SAP Applications 15 SP5
<br/>
<code>zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP5-2026-4392</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5
<br/>
<code>zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-ESPOS-2026-4392</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise High Performance Computing LTSS 15 SP5
<br/>
<code>zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-LTSS-2026-4392</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Server for SAP Applications 15 SP6
<br/>
<code>zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP6-2026-4392</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Server 15 SP4 LTSS
<br/>
<code>zypper in -t patch SUSE-SLE-Product-SLES-15-SP4-LTSS-2026-4392</code>
</li>
<li class="list-group-item">
Basesystem Module 15-SP7
<br/>
<code>zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP7-2026-4392</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Server 15 SP5 LTSS
<br/>
<code>zypper in -t patch SUSE-SLE-Product-SLES-15-SP5-LTSS-2026-4392</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Server 15 SP6 LTSS
<br/>
<code>zypper in -t patch SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-4392</code>
</li>
</ul>
<h2>Package List:</h2>
<ul>
<li>
SUSE Linux Enterprise Server for SAP Applications 15 SP4 (ppc64le x86_64)
<ul>
<li>cosign-3.1.3-150400.3.57.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4 (aarch64 x86_64)
<ul>
<li>cosign-3.1.3-150400.3.57.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise High Performance Computing LTSS 15 SP4 (aarch64 x86_64)
<ul>
<li>cosign-3.1.3-150400.3.57.1</li>
</ul>
</li>
<li>
openSUSE Leap 15.4 (aarch64 i586 ppc64le s390x x86_64)
<ul>
<li>cosign-3.1.3-150400.3.57.1</li>
<li>cosign-debuginfo-3.1.3-150400.3.57.1</li>
</ul>
</li>
<li>
openSUSE Leap 15.4 (noarch)
<ul>
<li>cosign-bash-completion-3.1.3-150400.3.57.1</li>
<li>cosign-fish-completion-3.1.3-150400.3.57.1</li>
<li>cosign-zsh-completion-3.1.3-150400.3.57.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Server for SAP Applications 15 SP5 (ppc64le x86_64)
<ul>
<li>cosign-3.1.3-150400.3.57.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5 (aarch64 x86_64)
<ul>
<li>cosign-3.1.3-150400.3.57.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise High Performance Computing LTSS 15 SP5 (aarch64 x86_64)
<ul>
<li>cosign-3.1.3-150400.3.57.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Server for SAP Applications 15 SP6 (ppc64le x86_64)
<ul>
<li>cosign-3.1.3-150400.3.57.1</li>
<li>cosign-debuginfo-3.1.3-150400.3.57.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Server 15 SP4 LTSS (aarch64 ppc64le s390x x86_64)
<ul>
<li>cosign-3.1.3-150400.3.57.1</li>
</ul>
</li>
<li>
Basesystem Module 15-SP7 (aarch64 ppc64le s390x x86_64)
<ul>
<li>cosign-3.1.3-150400.3.57.1</li>
<li>cosign-debuginfo-3.1.3-150400.3.57.1</li>
</ul>
</li>
<li>
Basesystem Module 15-SP7 (noarch)
<ul>
<li>cosign-bash-completion-3.1.3-150400.3.57.1</li>
<li>cosign-zsh-completion-3.1.3-150400.3.57.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Server 15 SP5 LTSS (aarch64 ppc64le s390x x86_64)
<ul>
<li>cosign-3.1.3-150400.3.57.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Server 15 SP6 LTSS (aarch64 ppc64le s390x x86_64)
<ul>
<li>cosign-3.1.3-150400.3.57.1</li>
<li>cosign-debuginfo-3.1.3-150400.3.57.1</li>
</ul>
</li>
</ul>
<h2>References:</h2>
<ul>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-56852.html">https://www.suse.com/security/cve/CVE-2026-56852.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-56854.html">https://www.suse.com/security/cve/CVE-2026-56854.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-56855.html">https://www.suse.com/security/cve/CVE-2026-56855.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-56864.html">https://www.suse.com/security/cve/CVE-2026-56864.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-78662.html">https://www.suse.com/security/cve/CVE-2026-78662.html</a>
</li>
<li>
<a href="https://www.suse.com/security/cve/CVE-2026-84304.html">https://www.suse.com/security/cve/CVE-2026-84304.html</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1272117">https://bugzilla.suse.com/show_bug.cgi?id=1272117</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1275025">https://bugzilla.suse.com/show_bug.cgi?id=1275025</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1278614">https://bugzilla.suse.com/show_bug.cgi?id=1278614</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1279215">https://bugzilla.suse.com/show_bug.cgi?id=1279215</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1282542">https://bugzilla.suse.com/show_bug.cgi?id=1282542</a>
</li>
</ul>
</div>