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.
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
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libyang · Debian 14 | 6.4.13-1 | DEBIAN-CVE-2026-44673 | May 14, 2026 |
| libyang · RHEL 10 | 2.1.148-2.el10_0.1 | RHSA-2026:49666 | May 14, 2026 |
| libyang · RHEL 8 | 0:1.0.184-2.el8_10 | RHSA-2026:24545 | Jun 24, 2026 |
| libyang · RHEL 9 | 0:2.1.148-1.el9_8.1 | RHSA-2026:25051 | Jun 24, 2026 |
| libyang · almalinux 10 | 2.1.148-4.el10_2 | ALSA-2026:24758 | Jun 9, 2026 |
| libyang · almalinux 8 | 1.0.184-2.el8_10 | ALSA-2026:24545 | Jun 8, 2026 |
| libyang · almalinux 9 | 2.1.148-1.el9_8.1 | ALSA-2026:25051 | Jun 10, 2026 |
| libyang · ol 10 | 0:2.1.148-4.el10_2 | ELSA-2026-24758 | Jul 16, 2026 |
| libyang · ol 8 | 0:1.0.184-2.el8_10 | ELSA-2026-24545 | Jun 9, 2026 |
| libyang · ol 9 | 0:2.1.148-1.el9_8.1 | ELSA-2026-25051 | Jun 23, 2026 |
| libyang · opensuse-leap 16.0 | 2.1.148-160000.4.1 | OPENSUSE-SU-2026:21113-1 | Jun 20, 2026 |
| libyang · rocky 10 | 0:2.1.148-4.el10_2 | RLSA-2026:24758 | Jun 11, 2026 |
| libyang · rocky 8 | 0:1.0.184-2.el8_10 | RLSA-2026:24545 | Jun 11, 2026 |
| libyang · rocky 9 | 0:2.1.148-1.el9_8.1 | RLSA-2026:25051 | Jun 13, 2026 |
| libyang · sles 15.6 | 2.1.55-150500.3.5.1 | SUSE-SU-2026:2335-1 | Jun 10, 2026 |
| libyang · sles 15.7 | 2.1.148-150700.3.5.1 | SUSE-SU-2026:2337-1 | Jun 10, 2026 |
| libyang · sles 16.0 | 2.1.148-160000.4.1 | SUSE-SU-2026:22208-1 | Jun 20, 2026 |
| libyang-devel · RHEL 9 | 0:2.1.148-1.el9_8.1 | RHSA-2026:25051 | Jun 24, 2026 |
| libyang-devel · almalinux 10 | 2.1.148-4.el10_2 | ALSA-2026:24758 | Jun 9, 2026 |
| libyang-devel · almalinux 9 | 2.1.148-1.el9_8.1 | ALSA-2026:25051 | Jun 10, 2026 |
| libyang-devel · ol 10 | 0:2.1.148-4.el10_2 | ELSA-2026-24758 | Jul 16, 2026 |
| libyang-devel · ol 9 | 0:2.1.148-1.el9_8.1 | ELSA-2026-25051 | Jun 23, 2026 |
| libyang-devel-doc · RHEL 9 | 0:2.1.148-1.el9_8.1 | RHSA-2026:25051 | Jun 24, 2026 |
| libyang-devel-doc · almalinux 10 | 2.1.148-4.el10_2 | ALSA-2026:24758 | Jun 9, 2026 |
| libyang-devel-doc · almalinux 9 | 2.1.148-1.el9_8.1 | ALSA-2026:25051 | Jun 10, 2026 |
| libyang-devel-doc · ol 10 | 0:2.1.148-4.el10_2 | ELSA-2026-24758 | Jul 16, 2026 |
| libyang-devel-doc · ol 9 | 0:2.1.148-1.el9_8.1 | ELSA-2026-25051 | Jun 23, 2026 |
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