CVE-2026-44673CWE-190

CVE-2026-44673

High · published May 15, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
61.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00953 · 61.0th percentile
Weakness
CWE-190 · Integer Overflow or Wraparound
Published
2026-05-15T01:16Z
References (15)
https://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh · [email protected]https://access.redhat.com/errata/RHSA-2026:24545 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:24758 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:25051 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:49666 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:51339 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:51351 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:51368 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:65467 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:65477 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:65508 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-44673 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2477617 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh · 134c704f-9b21-4f2e-91b3-4a467353bcc0https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44673.json · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
EPSS history
Timeline
  • 14 MAY 20:35Z
    libyang: lyb_read_string() integer overflow → heap buffer overflow
    cvelistv5