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CVE-2026-44673

libyang: lyb_read_string() integer overflow → heap buffer overflow

Published: May 14, 2026Updated: Aug 7, 2026 Sources: CVE List NVDCWE-190
7.5HIGH
NVD MITRE
EPSS Score
0.5%
Top 57.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-190

Affected Products

CESNET
oss-project
libyangLibrary
OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
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References

https://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh
github.com
https://access.redhat.com/errata/RHSA-2026:24545
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:24758
access.redhat.com
and 8 more references View all →

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