CVE-2026-44673
Medium
Elevated severity or exploit probability.
CVSS base
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS — probability of exploitation (30 days)
1.0%
59.7th percentile
CISA KEV
Not listed
Weakness / dates
CWE-190
Published 2026-05-14 · modified 2026-09-09
CVSS breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
| Attack Vector | N | Network |
| Attack Complexity | L | Low |
| Privileges Required | N | None |
| User Interaction | N | None |
| Scope | U | Unchanged |
| Confidentiality | N | None |
| Integrity | N | None |
| Availability | H | High |
Timeline
- 2026-05-14 — Published (NVD)
- 2026-09-09 — Last modified (NVD)
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.
References
- https://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh
- 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://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44673.json