CVE catalog
CVE-2026-44673
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 malicious
- Severity
- High · CVSS 8.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.64% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libyang2 | bookworm | 2.1.30-2 | vulnerable |
| Cpe | libyang2 | Not reported | Not reported | vulnerable |
| Suse | libyang | linux enterprise high performance computing 15 sp4-espos | 1.0.184-150300.3.9.1 | fixed |
| Suse | libyang | linux enterprise high performance computing 15 sp4-ltss | 1.0.184-150300.3.9.1 | fixed |
| Suse | libyang | linux enterprise server 15 sp4-ltss | 1.0.184-150300.3.9.1 | fixed |
| Suse | libyang | linux enterprise server for sap applications 15 sp4 | 1.0.184-150300.3.9.1 | fixed |
| Opensuse | libyang | tumbleweed | 3.13.6-3.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libyang2 | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Suse | libyang | rpm | linux enterprise high performance computing 15 sp4-espos | 1.0.184-150300.3.9.1 | Not reported | SUSE-SU-2026:2381-1 | Not reported |
| Suse | libyang | rpm | linux enterprise high performance computing 15 sp4-ltss | 1.0.184-150300.3.9.1 | Not reported | SUSE-SU-2026:2381-1 | Not reported |
| Suse | libyang | rpm | linux enterprise server 15 sp4-ltss | 1.0.184-150300.3.9.1 | Not reported | SUSE-SU-2026:2381-1 | Not reported |
| Suse | libyang | rpm | linux enterprise server for sap applications 15 sp4 | 1.0.184-150300.3.9.1 | Not reported | SUSE-SU-2026:2381-1 | Not reported |
| Opensuse | libyang | rpm | tumbleweed | 3.13.6-3.1 | Not reported | OPENSUSE-SU-2026:10880-1 | Not reported |
Notes
[bookworm] libyang2: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libyang2]Affected
Details (2)
2.1.30-2· amd64 · bookwormAffected
nvd · libyang2 · debian · bookworm; nvd · libyang2 · debian · 12
2.1.30-2· arm64 · bookwormAffected
nvd · libyang2 · debian · bookworm; nvd · libyang2 · debian · 12
- [libyang2-dev]Affected
Source package: [libyang2]
Details (2)
2.1.30-2· amd64 · bookwormAffected
nvd · libyang2 · debian · bookworm; nvd · libyang2 · debian · 12
2.1.30-2· arm64 · bookwormAffected
nvd · libyang2 · debian · bookworm; nvd · libyang2 · debian · 12
- [libyang2-tools]Affected
Source package: [libyang2]
Details (2)
2.1.30-2· amd64 · bookwormAffected
nvd · libyang2 · debian · bookworm; nvd · libyang2 · debian · 12
2.1.30-2· arm64 · bookwormAffected
nvd · libyang2 · debian · bookworm; nvd · libyang2 · debian · 12
- [libyang-tools]Affected
Source package: [libyang2]
Details (2)
2.1.30-2· all · bookwormAffected
nvd · libyang2 · debian · bookworm; nvd · libyang2 · debian · 12
2.1.30-2· all · bookwormAffected
nvd · libyang2 · debian · bookworm; nvd · libyang2 · debian · 12
[Debian 13 (Trixie)]
- [libyang3]Affected
Source package: [libyang]
Details (4)
3.12.2-1· amd64 · trixieAffected
nvd · libyang · debian · 13
3.12.2-1· arm64 · trixieAffected
nvd · libyang · debian · 13
3.13.6-1~bpo13+1· amd64 · trixie-backportsAffected
nvd · libyang · debian · 13
3.13.6-1~bpo13+1· arm64 · trixie-backportsAffected
nvd · libyang · debian · 13
- [libyang3-tools]Affected
Source package: [libyang]
Details (4)
3.12.2-1· amd64 · trixieAffected
nvd · libyang · debian · 13
3.12.2-1· arm64 · trixieAffected
nvd · libyang · debian · 13
3.13.6-1~bpo13+1· amd64 · trixie-backportsAffected
nvd · libyang · debian · 13
3.13.6-1~bpo13+1· arm64 · trixie-backportsAffected
nvd · libyang · debian · 13
- [libyang-dev]Affected
Source package: [libyang]
Details (4)
3.12.2-1· amd64 · trixieAffected
nvd · libyang · debian · 13
3.12.2-1· arm64 · trixieAffected
nvd · libyang · debian · 13
3.13.6-1~bpo13+1· amd64 · trixie-backportsAffected
nvd · libyang · debian · 13
3.13.6-1~bpo13+1· arm64 · trixie-backportsAffected
nvd · libyang · debian · 13
[openSUSE Tumbleweed]
- [libyang3]Unknown
Source package: [libyang]
Details (1)
3.13.6-3.3· x86_64 · tumbleweedUnknown · Fixed:
3.13.6-3.1Version impact unknown
nvd · libyang · opensuse · tumbleweed
- [libyang-devel]Unknown
Source package: [libyang]
Details (1)
3.13.6-3.3· x86_64 · tumbleweedUnknown · Fixed:
3.13.6-3.1Version impact unknown
nvd · libyang · opensuse · tumbleweed
- [libyang-doc]Unknown
Source package: [libyang]
Details (1)
3.13.6-3.3· noarch · tumbleweedUnknown · Fixed:
3.13.6-3.1Version impact unknown
nvd · libyang · opensuse · tumbleweed
- [yang-tools]Unknown
Source package: [libyang]
Details (1)
3.13.6-3.3· x86_64 · tumbleweedUnknown · Fixed:
3.13.6-3.1Version impact unknown
nvd · libyang · opensuse · tumbleweed
Observed:
References
- [https://access.redhat.com/errata/RHSA-2026:24545]
- [https://access.redhat.com/errata/RHSA-2026:24758]
- [https://access.redhat.com/errata/RHSA-2026:25051]
- [https://access.redhat.com/errata/RHSA-2026:49666]
- [https://access.redhat.com/errata/RHSA-2026:51339]
- [https://access.redhat.com/errata/RHSA-2026:51351]
- [https://access.redhat.com/errata/RHSA-2026:51368]
- [https://access.redhat.com/errata/RHSA-2026:65467]
- [https://access.redhat.com/errata/RHSA-2026:65477]
- [https://access.redhat.com/errata/RHSA-2026:65508]
- [https://access.redhat.com/security/cve/CVE-2026-44673]
- [https://bugzilla.redhat.com/show_bug.cgi?id=2477617]
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2026_65508.json]
- [https://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-44673]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-44673]
- [https://osv.dev/vulnerability/SUSE-SU-2026:2381-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-44673]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10880-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-44673]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44673.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1820.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]