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

CVSS 7.5 · High
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I. Basic Information for CVE-2026-44673

Vulnerability Information
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Vulnerability Title
libyang: lyb_read_string() integer overflow → heap buffer overflow
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数溢出或超界折返
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
CESNETlibyang < SO 5.2.15 -

II. Public POCs for CVE-2026-44673

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III. Intelligence Information for CVE-2026-44673

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IV. Related Vulnerabilities

Same product: libyang
Same vendor: CESNET
Same weakness: CWE-190

V. Comments for CVE-2026-44673

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