What is CVE-2026-44673?

CVE-2026-44673 is a high-severity vulnerability in Cesnet Libyang, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-05-14.

How severe is CVE-2026-44673?

High severity. CVSS v3 base score is 7.5 out of 10.

Integer overflow in Cesnet Libyang

CVE-2026-44673

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…

Vulnerability class: Integer Overflow

EPSS: 0.001 (21.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Cesnet Libyang — versions < SO 5.2.15

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-44673?: CVE-2026-44673 is a high-severity vulnerability in Cesnet Libyang, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-05-14.
How severe is CVE-2026-44673?: High severity. CVSS v3 base score is 7.5 out of 10.