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Critical Security Vulnerability in Libyang Buffer Overflow CVE-2026-44673

suse
Calendar Grey June 12, 2026
Dist Suse Esm H88
An important security fix for libyang resolves a severe buffer overflow issue affecting multiple SUSE distributions.
An update that solves one vulnerability can now be installed.

Summary

## This update for libyang fixes the following issue * CVE-2026-44673: integer overflow in `lyb_read_string()` of `src/parser_lyb.c` leads to heap buffer overflow when parsing a maliciously crafted LYB binary blob (bsc#1265330). ## 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: * openSUSE Leap 15.3 zypper in -t patch SUSE-2026-2381=1 * SUSE Linux Enterprise High Performance Computing LTSS 15 SP4 zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-LTSS-2026-2381=1 * SUSE Linux Enterprise Server 15 SP4 LTSS zypper in -t patch SUSE-SLE-Product-SLES-15-SP4-LTSS-2026-2381=1 * SUSE Linux Enterprise Server for SAP Applications 15 SP4

Topics%20covered

Topics Covered

security advisory buffer overflow important OpenSUSE libyang CVE-2026-44673

References

* bsc#1265330

Cross-

* CVE-2026-44673

CVSS scores:

* CVE-2026-44673 ( SUSE ): 8.8

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

* CVE-2026-44673 ( SUSE ): 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

* CVE-2026-44673 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products:

* openSUSE Leap 15.3

* SUSE Linux Enterprise High Performance Computing 15 SP4

* SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4

* SUSE Linux Enterprise High Performance Computing LTSS 15 SP4

* SUSE Linux Enterprise Server 15 SP4

* SUSE Linux Enterprise Server 15 SP4 LTSS

* SUSE Linux Enterprise Server for SAP Applications 15 SP4

An update that solves one vulnerability can now be installed.

##

* https://www.suse.com/security/cve/CVE-2026-44673.html

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:2381-1
Release Date: 2026-06-12T06:50:59Z
Rating: important

Topics%20covered

Topics Covered

security advisory buffer overflow important OpenSUSE libyang CVE-2026-44673

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