# CVE-2026-44673: libyang: lyb_read_string() integer overflow → heap buffer overflow CVE-2026-44673 is fixed in 3 products on 1 platform, first by RHSA-2026:49666, released May 14, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-44673 - Priority: High - CVSS: 7.5 (Important) - EPSS: 0.0064 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: May 14, 2026 - Weakness: Integer Overflow or Wraparound - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44673 ## Description libyang is a YANG data modeling language library. Prior to SO 5.2.15, lyb_read_string() in src/parser_lyb.c contains an integer overflow that results in a heap buffer overflow when parsing a maliciously crafted LYB binary blob. An attacker who can supply LYB data to any libyang consumer (NETCONF server, sysrepo, etc.) can trigger a crash or potential heap corruption. This vulnerability is fixed in SO 5.2.15. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libyang Debian 14 | 6.4.13-1 | [DEBIAN-CVE-2026-44673](https://patchblox.com/security/data/fix/linux/debian-cve-2026-44673.md) | May 14, 2026 | | Linux | libyang RHEL 10 | 2.1.148-2.el10_0.1 | [RHSA-2026:49666](https://patchblox.com/security/data/fix/linux/rhsa-2026-49666.md) | May 14, 2026 | | Linux | libyang RHEL 8 | 0:1.0.184-2.el8_10 | [RHSA-2026:24545](https://patchblox.com/security/data/fix/linux/rhsa-2026-24545.md) | Jun 24, 2026 | | Linux | libyang RHEL 9 | 0:2.1.148-1.el9_8.1 | [RHSA-2026:25051](https://patchblox.com/security/data/fix/linux/rhsa-2026-25051.md) | Jun 24, 2026 | | Linux | libyang almalinux 10 | 2.1.148-4.el10_2 | [ALSA-2026:24758](https://patchblox.com/security/data/fix/linux/alsa-2026-24758.md) | Jun 9, 2026 | | Linux | libyang almalinux 8 | 1.0.184-2.el8_10 | [ALSA-2026:24545](https://patchblox.com/security/data/fix/linux/alsa-2026-24545.md) | Jun 8, 2026 | | Linux | libyang almalinux 9 | 2.1.148-1.el9_8.1 | [ALSA-2026:25051](https://patchblox.com/security/data/fix/linux/alsa-2026-25051.md) | Jun 10, 2026 | | Linux | libyang ol 10 | 0:2.1.148-4.el10_2 | [ELSA-2026-24758](https://patchblox.com/security/data/fix/linux/elsa-2026-24758.md) | Jul 16, 2026 | | Linux | libyang ol 8 | 0:1.0.184-2.el8_10 | [ELSA-2026-24545](https://patchblox.com/security/data/fix/linux/elsa-2026-24545.md) | Jun 9, 2026 | | Linux | libyang ol 9 | 0:2.1.148-1.el9_8.1 | [ELSA-2026-25051](https://patchblox.com/security/data/fix/linux/elsa-2026-25051.md) | Jun 23, 2026 | | Linux | libyang opensuse-leap 16.0 | 2.1.148-160000.4.1 | [OPENSUSE-SU-2026:21113-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21113-1.md) | Jun 20, 2026 | | Linux | libyang rocky 10 | 0:2.1.148-4.el10_2 | [RLSA-2026:24758](https://patchblox.com/security/data/fix/linux/rlsa-2026-24758.md) | Jun 11, 2026 | | Linux | libyang rocky 8 | 0:1.0.184-2.el8_10 | [RLSA-2026:24545](https://patchblox.com/security/data/fix/linux/rlsa-2026-24545.md) | Jun 11, 2026 | | Linux | libyang rocky 9 | 0:2.1.148-1.el9_8.1 | [RLSA-2026:25051](https://patchblox.com/security/data/fix/linux/rlsa-2026-25051.md) | Jun 13, 2026 | | Linux | libyang sles 15.6 | 2.1.55-150500.3.5.1 | [SUSE-SU-2026:2335-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2335-1.md) | Jun 10, 2026 | | Linux | libyang sles 15.7 | 2.1.148-150700.3.5.1 | [SUSE-SU-2026:2337-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2337-1.md) | Jun 10, 2026 | | Linux | libyang sles 16.0 | 2.1.148-160000.4.1 | [SUSE-SU-2026:22208-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22208-1.md) | Jun 20, 2026 | | Linux | libyang-devel RHEL 9 | 0:2.1.148-1.el9_8.1 | [RHSA-2026:25051](https://patchblox.com/security/data/fix/linux/rhsa-2026-25051.md) | Jun 24, 2026 | | Linux | libyang-devel almalinux 10 | 2.1.148-4.el10_2 | [ALSA-2026:24758](https://patchblox.com/security/data/fix/linux/alsa-2026-24758.md) | Jun 9, 2026 | | Linux | libyang-devel almalinux 9 | 2.1.148-1.el9_8.1 | [ALSA-2026:25051](https://patchblox.com/security/data/fix/linux/alsa-2026-25051.md) | Jun 10, 2026 | | Linux | libyang-devel ol 10 | 0:2.1.148-4.el10_2 | [ELSA-2026-24758](https://patchblox.com/security/data/fix/linux/elsa-2026-24758.md) | Jul 16, 2026 | | Linux | libyang-devel ol 9 | 0:2.1.148-1.el9_8.1 | [ELSA-2026-25051](https://patchblox.com/security/data/fix/linux/elsa-2026-25051.md) | Jun 23, 2026 | | Linux | libyang-devel-doc RHEL 9 | 0:2.1.148-1.el9_8.1 | [RHSA-2026:25051](https://patchblox.com/security/data/fix/linux/rhsa-2026-25051.md) | Jun 24, 2026 | | Linux | libyang-devel-doc almalinux 10 | 2.1.148-4.el10_2 | [ALSA-2026:24758](https://patchblox.com/security/data/fix/linux/alsa-2026-24758.md) | Jun 9, 2026 | | Linux | libyang-devel-doc almalinux 9 | 2.1.148-1.el9_8.1 | [ALSA-2026:25051](https://patchblox.com/security/data/fix/linux/alsa-2026-25051.md) | Jun 10, 2026 | | Linux | libyang-devel-doc ol 10 | 0:2.1.148-4.el10_2 | [ELSA-2026-24758](https://patchblox.com/security/data/fix/linux/elsa-2026-24758.md) | Jul 16, 2026 | | Linux | libyang-devel-doc ol 9 | 0:2.1.148-1.el9_8.1 | [ELSA-2026-25051](https://patchblox.com/security/data/fix/linux/elsa-2026-25051.md) | Jun 23, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. 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