libyang: lyb_read_string() integer overflow → heap buffer overflow_CVE-2026-44673

7.5 / 10

HIGH

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

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.

Basic Information

ID CVE-2026-44673

Source GitHub_M

Published May 14, 2026 at 20:35

Affected Product

Vendor CESNET

Product libyang

Version < SO 5.2.15

Affected Versions CESNET libyang < SO 5.2.15

CWE Classification

CWE-190

References

github.com /CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh

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    "published": "2026-05-14T20:35:13.963Z",
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