Security update for libyang

Announcement ID:	SUSE-SU-2026:2335-1
Release Date:	2026-06-10T08:43:18Z
Rating:	important
References:	bsc#1265330 bsc#1266316
Cross-References:	CVE-2026-41401 CVE-2026-44673
CVSS scores:	CVE-2026-41401 ( SUSE ): 9.2 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVE-2026-41401 ( SUSE ): 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVE-2026-41401 ( NVD ): 7.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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 CVE-2026-41401 ( NVD ): 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H 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 15.5 SUSE Linux Enterprise High Performance Computing 15 SP5 SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5 SUSE Linux Enterprise High Performance Computing LTSS 15 SP5 SUSE Linux Enterprise Server 15 SP5 SUSE Linux Enterprise Server 15 SP5 LTSS SUSE Linux Enterprise Server 15 SP6 SUSE Linux Enterprise Server 15 SP6 LTSS SUSE Linux Enterprise Server for SAP Applications 15 SP5 SUSE Linux Enterprise Server for SAP Applications 15 SP6

An update that solves two vulnerabilities can now be installed.

Description:

This update for libyang fixes the following issues

• CVE-2026-41401: use-after-free in lyd_parser_set_data_flags when processing crafted YANG XML documents with specific metadata attributes (bsc#1266316).
• 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 15.5
  zypper in -t patch SUSE-2026-2335=1
• SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5
  zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-ESPOS-2026-2335=1
• SUSE Linux Enterprise High Performance Computing LTSS 15 SP5
  zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-LTSS-2026-2335=1
• SUSE Linux Enterprise Server 15 SP5 LTSS
  zypper in -t patch SUSE-SLE-Product-SLES-15-SP5-LTSS-2026-2335=1
• SUSE Linux Enterprise Server 15 SP6 LTSS
  zypper in -t patch SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-2335=1
• SUSE Linux Enterprise Server for SAP Applications 15 SP5
  zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP5-2026-2335=1
• SUSE Linux Enterprise Server for SAP Applications 15 SP6
  zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP6-2026-2335=1

Package List:

• openSUSE Leap 15.5 (aarch64 ppc64le s390x x86_64 i586)
  • libyang-debuginfo-2.1.55-150500.3.5.1
  • libyang-debugsource-2.1.55-150500.3.5.1
  • yang-tools-debuginfo-2.1.55-150500.3.5.1
  • libyang2-debuginfo-2.1.55-150500.3.5.1
  • yang-tools-2.1.55-150500.3.5.1
  • libyang2-2.1.55-150500.3.5.1
  • libyang-devel-2.1.55-150500.3.5.1
• openSUSE Leap 15.5 (noarch)
  • libyang-doc-2.1.55-150500.3.5.1
• SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5 (aarch64 x86_64)
  • libyang-debuginfo-2.1.55-150500.3.5.1
  • libyang-debugsource-2.1.55-150500.3.5.1
  • libyang2-2.1.55-150500.3.5.1
  • libyang2-debuginfo-2.1.55-150500.3.5.1
• SUSE Linux Enterprise High Performance Computing LTSS 15 SP5 (aarch64 x86_64)
  • libyang-debuginfo-2.1.55-150500.3.5.1
  • libyang-debugsource-2.1.55-150500.3.5.1
  • libyang2-2.1.55-150500.3.5.1
  • libyang2-debuginfo-2.1.55-150500.3.5.1
• SUSE Linux Enterprise Server 15 SP5 LTSS (aarch64 ppc64le s390x x86_64)
  • libyang-debuginfo-2.1.55-150500.3.5.1
  • libyang-debugsource-2.1.55-150500.3.5.1
  • libyang2-2.1.55-150500.3.5.1
  • libyang2-debuginfo-2.1.55-150500.3.5.1
• SUSE Linux Enterprise Server 15 SP6 LTSS (aarch64 ppc64le s390x x86_64)
  • libyang-debuginfo-2.1.55-150500.3.5.1
  • libyang-debugsource-2.1.55-150500.3.5.1
  • libyang2-2.1.55-150500.3.5.1
  • libyang2-debuginfo-2.1.55-150500.3.5.1
• SUSE Linux Enterprise Server for SAP Applications 15 SP5 (ppc64le x86_64)
  • libyang-debuginfo-2.1.55-150500.3.5.1
  • libyang-debugsource-2.1.55-150500.3.5.1
  • libyang2-2.1.55-150500.3.5.1
  • libyang2-debuginfo-2.1.55-150500.3.5.1
• SUSE Linux Enterprise Server for SAP Applications 15 SP6 (ppc64le x86_64)
  • libyang-debuginfo-2.1.55-150500.3.5.1
  • libyang-debugsource-2.1.55-150500.3.5.1
  • libyang2-2.1.55-150500.3.5.1
  • libyang2-debuginfo-2.1.55-150500.3.5.1

References:

• https://www.suse.com/security/cve/CVE-2026-41401.html
• https://www.suse.com/security/cve/CVE-2026-44673.html
• https://bugzilla.suse.com/show_bug.cgi?id=1265330
• https://bugzilla.suse.com/show_bug.cgi?id=1266316