CVE-2026-51540

critical · 9.8

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).

9.8

CVSS

0.4%

EPSS (exploit prob.)

36th

EPSS percentile

2026-07-13

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-191

Affected products

Vendor	Product	Affected versions
opener_project	opener	2.3.0

Check a specific version with /api/v1/cve/match.

References

https://gist.github.com/MrAlaskan/5e0c2af7f4a1d188814c7fa8f812c8da
https://github.com/EIPStackGroup/OpENer/issues/568
https://github.com/EIPStackGroup/OpENer/issues/568

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-51540