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SUSE OVMF Significant mbedtls Memory Overflow Issues 2026-21981-1

suse
Calendar Grey June 3, 2026
Dist Suse Esm H88
This update addresses four significant issues in SUSE's OVMF package, enhancing overall system security.
An update that solves four vulnerabilities can now be installed.

Summary

## This update for ovmf fixes the following issues: * CVE-2026-25833: mbedtls: buffer overflow in the `x509_inet_pton_ipv6()` function (bsc#1261476). * CVE-2026-25834: mbedtls: client accepts signature algorithm chosen by server even if not advertised in client hello (bsc#1261477). * CVE-2026-25835: mbedtls: no pseudo-random number generator reseed when cloning an application (bsc#1261478). * CVE-2026-34874: mbedtls: NULL pointer dereference in distinguished name parsing (bsc#1261469). ## Patch Instructions: To install this SUSE update use the SUSE recommended installation methods like YaST online_update or "zypper patch". Alternatively you can run the command listed for your product: * SUSE Linux Micro 6.2 zypper in -t patch SUSE-SL-Micro-6.2-865=1 ## Package List: * SUSE Linux Micro 6.2 (noarch)

References

* bsc#1261469

* bsc#1261476

* bsc#1261477

* bsc#1261478

Cross-

* CVE-2026-25833

* CVE-2026-25834

* CVE-2026-25835

* CVE-2026-34874

CVSS scores:

* CVE-2026-25833 ( SUSE ): 8.7

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

* CVE-2026-25833 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

* CVE-2026-25833 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

* CVE-2026-25834 ( SUSE ): 6.9

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

* CVE-2026-25834 ( SUSE ): 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

* CVE-2026-25834 ( NVD ): 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

* CVE-2026-25835 ( SUSE ): 8.5

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:21981-1
Release Date: 2026-06-02T09:33:25Z
Rating: important

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