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Vulnerability record · CVE-2026-44673 · published 14 May 2026

CVE-2026-44673: Integer overflow vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.95% · top 40.2% CWE-190 · Integer overflow Deferred
7.5CVSS 3.1 base score
0.95%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
15References
9 Sep 2026Last modified by 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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-44673), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.