What is CVE-2026-51540?

CVE-2026-51540 is a critical-severity vulnerability in Opener Project, classified under Integer Underflow. CVSS score: 9.8/10. Published 2026-07-13.

How severe is CVE-2026-51540?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Integer overflow in Opener Project

CVE-2026-51540

OpENer 2.3.0 (master branch up to commit 76b95cf) is vulnerable to a severe memory corruption issue caused by an integer underflow in the processing of connected explicit messages (SendUnitData).

EPSS: 0.004 (35.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Opener_project Opener — versions 2.3.0
N/a — versions n/a

Weakness classification (CWE)

CWE-191 — Integer Underflow

References

cve@mitre.org (Third Party Advisory)
cve@mitre.org (Exploit, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-51540?: CVE-2026-51540 is a critical-severity vulnerability in Opener Project, classified under Integer Underflow. CVSS score: 9.8/10. Published 2026-07-13.
How severe is CVE-2026-51540?: Critical severity. CVSS v3 base score is 9.8 out of 10.