CVE-2026-44673
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.54%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.54% probability · 44th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-190
- Source
- security-advisories@github.com
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.