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

Quick assessment

Affected
CESNET libyang
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libyang是CESNET开源的一款使用C语言编写的YANG数据建模语言解析器和工具包。 libyang 5.2.15之前版本存在输入验证错误漏洞，该漏洞源于lyb_read_string函数存在整数溢出，可能导致堆缓冲区溢出。

CVSS 7.5 · High EPSS 0.95% · P60

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
CESNET libyang < SO 5.2.15 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
libyang 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libyang是CESNET开源的一款使用C语言编写的YANG数据建模语言解析器和工具包。 libyang 5.2.15之前版本存在输入验证错误漏洞，该漏洞源于lyb_read_string函数存在整数溢出，可能导致堆缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
CESNET libyang < 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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Vendor Advisories for CVE-2026-44673 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-44673

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