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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| CESNET | libyang | < SO 5.2.15 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libyang | 6.4.13-1 | — |
| Debian 13 | libyang | No fix yet | — |
| Debian 12 | libyang2 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | libyang +2 | 2.1.148-4.el10_2 | RHSA-2026:24758 |
| RHEL 9 | libyang +2 | 2.1.148-1.el9_8.1 | RHSA-2026:25051 |
| RHEL 8 | libyang | 1.0.184-2.el8_10 | RHSA-2026:24545 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | libyang | 2.1.148-2.el10_0.1 | RHSA-2026:49666 |
| RHEL 9.6 EUS | libyang | 2.1.148-1.el9_6.1 | RHSA-2026:65508 |
| RHEL 9.4 E4S | libyang | 2.1.148-1.el9_4.1 | RHSA-2026:65467 |
| RHEL 9.2 E4S | libyang | 2.1.148-1.el9_2.1 | RHSA-2026:65477 |
| RHEL 8.8 TUS | libyang | 1.0.184-1.el8_8.1 | RHSA-2026:51339 |
| RHEL 8.8 E4S | libyang | 1.0.184-1.el8_8.1 | RHSA-2026:51339 |
| RHEL 8.6 EUS Long Life | libyang | 1.0.184-1.el8_6.1 | RHSA-2026:51368 |
| RHEL 8.6 AUS | libyang | 1.0.184-1.el8_6.1 | RHSA-2026:51368 |
| RHEL 8.4 EUS Long Life | libyang | 1.0.184-1.el8_4.1 | RHSA-2026:51351 |
| RHEL 8.4 AUS | libyang | 1.0.184-1.el8_4.1 | RHSA-2026:51351 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | libyang +2 | 2.1.148-4.el10_2 | ALSA-2026:24758 |
| AlmaLinux 9 | libyang +2 | 2.1.148-1.el9_8.1 | ALSA-2026:25051 |
| AlmaLinux 8 | libyang | 1.0.184-2.el8_10 | ALSA-2026:24545 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | libyang | 2.1.148-4.el10_2 | RLSA-2026:24758 |
| Rocky Linux 9 | libyang | 2.1.148-1.el9_8.1 | RLSA-2026:25051 |
| Rocky Linux 8 | libyang | 1.0.184-2.el8_10 | RLSA-2026:24545 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libyang | 2.1.148-150700.3.5.1 | SUSE-SU-2026:2337-1 |
| SLES 15 SP6 | libyang | 2.1.55-150500.3.5.1 | SUSE-SU-2026:2335-1 |
| SLES 15 SP5 | libyang | 2.1.55-150500.3.5.1 | SUSE-SU-2026:2335-1 |
| SLES 15 SP4 | libyang | 1.0.184-150300.3.9.1 | SUSE-SU-2026:2381-1 |
| SLES 12 SP5 | libyang | 2.1.148-8.8.1 | SUSE-SU-2026:2334-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | libyang | 2.1.148-160000.4.1 | SUSE-SU-2026:22208-1, SUSE-SU-2026:22200-1 |
| SLES for SAP 15 SP6 | libyang | 2.1.55-150500.3.5.1 | SUSE-SU-2026:2335-1 |
| SLES for SAP 15 SP5 | libyang | 2.1.55-150500.3.5.1 | SUSE-SU-2026:2335-1 |
| SLES for SAP 15 SP4 | libyang | 1.0.184-150300.3.9.1 | SUSE-SU-2026:2381-1 |
| SLES 16.0 | libyang | 2.1.148-160000.4.1 | SUSE-SU-2026:22208-1, SUSE-SU-2026:22200-1 |
| SLE HPC 15 SP5 | libyang | 2.1.55-150500.3.5.1 | SUSE-SU-2026:2335-1 |
| SLE HPC 15 SP4 | libyang | 1.0.184-150300.3.9.1 | SUSE-SU-2026:2381-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libyang | 3.13.6-3.1 | openSUSE-SU-2026:10880-1 |
| openSUSE Leap 16.0 | libyang | 2.1.148-160000.4.1 | openSUSE-SU-2026:21113-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libyang | 2.1.148-3 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | libyang +2 | 2.1.148-4.el10_2 | ELSA-2026-24758 |
| Oracle Linux 9 | libyang +2 | 2.1.148-1.el9_8.1 | ELSA-2026-25051 |
| Oracle Linux 8 | libyang | 1.0.184-2.el8_10 | ELSA-2026-24545 |
Advisories 28
- ALSA-2026:25051 Important: libyang security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:24758 Important: libyang security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:24545 Important: libyang security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:65508 Red Hat Security Advisory: libyang security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:65467 Red Hat Security Advisory: libyang security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:65477 Red Hat Security Advisory: libyang security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:51368 Red Hat Security Advisory: libyang security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:51339 Red Hat Security Advisory: libyang security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:51351 Red Hat Security Advisory: libyang security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:49666 Red Hat Security Advisory: libyang security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:25051 Red Hat Security Advisory: libyang security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:24758 Red Hat Security Advisory: libyang security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- RHSA-2026:24545 Red Hat Security Advisory: libyang security update Red Hat Security Advisories (RHSA) · Sep 9, 2026
- WID-SEC-2026-1820 Red Hat Enterprise Linux (libyang): Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Sep 8, 2026
- ELSA-2026-24758 Important: libyang security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 16, 2026
- openSUSE-SU-2026:21113-1 Security update for libyang SUSE / openSUSE Security Updates · Jun 30, 2026
- SUSE-SU-2026:22208-1 Security update for libyang SUSE / openSUSE Security Updates · Jun 24, 2026
- SUSE-SU-2026:22200-1 Security update for libyang SUSE / openSUSE Security Updates · Jun 24, 2026
- ELSA-2026-25051 Important: libyang security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 23, 2026
- SUSE-SU-2026:2381-1 Security update for libyang SUSE / openSUSE Security Updates · Jun 13, 2026
- RLSA-2026:25051 Important: libyang security update Rocky Linux Security Advisories · Jun 13, 2026
- RLSA-2026:24758 Important: libyang security update Rocky Linux Security Advisories · Jun 11, 2026
- SUSE-SU-2026:2334-1 Security update for libyang SUSE / openSUSE Security Updates · Jun 11, 2026
- SUSE-SU-2026:2335-1 Security update for libyang SUSE / openSUSE Security Updates · Jun 11, 2026
- SUSE-SU-2026:2337-1 Security update for libyang SUSE / openSUSE Security Updates · Jun 11, 2026
- RLSA-2026:24545 Important: libyang security update Rocky Linux Security Advisories · Jun 11, 2026
- ELSA-2026-24545 Important: libyang security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 9, 2026
- openSUSE-SU-2026:10880-1 libyang-devel-3.13.6-3.1 on GA media SUSE / openSUSE Security Updates · May 29, 2026