CVE-2026-44673
HIGHlibyang: lyb_read_string() integer overflow → heap buffer overflow
Title source: cnaDescription
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 (1)
Core 1
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh
Scores
CVSS v3
7.5
EPSS
0.0027
EPSS Percentile
18.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-190
Status
published
Products (1)
CESNET/libyang
< SO 5.2.15
Published
May 14, 2026
Tracked Since
May 15, 2026