CVE-2026-51536

In OpENer 2.3.0 (commit 76b95cf) when parsing incoming CIP (Common Industrial Protocol) network packets, the length parameter is inconsistently typed across the call stack. Specifically, an upstream length calculated as an int is passed to a downstream function that expects an EipInt16 (a 16-bit signed integer). If a maliciously crafted packet with specific length fields is processed, the length parameter can overflow or be truncated into a negative value. This negative length bypasses subsequent bounds checking (due to signed/unsigned comparison issues) and is ultimately used in memory operations, leading to a Stack Buffer Overflow when reading data in DecodePaddedEPath.

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://gist.github.com/MrAlaskan/e160c626a32e03e5d9eddaa732560672	Third Party Advisory
https://github.com/EIPStackGroup/OpENer/issues/563	Exploit Issue Tracking Vendor Advisory
https://github.com/EIPStackGroup/OpENer/issues/563	Exploit Issue Tracking Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:opener_project:opener:2.3.0:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-13 22:16

Updated : 2026-08-11 16:43

NVD link : CVE-2026-51536

Mitre link : CVE-2026-51536

CVE.ORG link : CVE-2026-51536

JSON object : View

Products Affected

opener_project

opener

CWE

CWE-190

Integer Overflow or Wraparound

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