CVE-2026-51536
OpENer Stack Buffer Overflow
Description
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.
INFO
Published Date :
July 13, 2026, 10:16 p.m.
Last Modified :
Aug. 11, 2026, 4:43 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update to a patched version of OpENer.
- Ensure consistent integer typing in packet length handling.
- Validate all length parameters rigorously.
- Review memory operations using parsed lengths.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-51536.
| URL | 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-51536 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-51536
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-51536 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-51536 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 11, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:opener_project:opener:2.3.0:*:*:*:*:*:*:* Added Reference Type MITRE: https://gist.github.com/MrAlaskan/e160c626a32e03e5d9eddaa732560672 Types: Third Party Advisory Added Reference Type MITRE: https://github.com/EIPStackGroup/OpENer/issues/563 Types: Exploit, Issue Tracking, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/EIPStackGroup/OpENer/issues/563 Types: Exploit, Issue Tracking, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 14, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Added CWE CWE-190 Added Reference https://github.com/EIPStackGroup/OpENer/issues/563 Added SSVC {'id': 'CVE-2026-51536', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-14T13:39:30.480131Z'} -
New CVE Received by [email protected]
Jul. 13, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'n/a', 'product': 'n/a', 'versions': [{'status': 'affected', 'version': 'n/a'}]}] Added Description 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. Added Reference https://gist.github.com/MrAlaskan/e160c626a32e03e5d9eddaa732560672 Added Reference https://github.com/EIPStackGroup/OpENer/issues/563