CVE-2026-51541
OpENer Out-of-Bounds Read
Description
OpENer 2.3.0 (commit 76b95cf) has an out-of-bounds read issue in CIP message parsing when handling malformed explicit requests with a forged EPath size. An attacker can send a valid ENIP SendRRData frame carrying a very short CIP payload whose path_size field claims that many more path words are present than are actually available. Because the parser trusts the attacker-controlled path_size and continues decoding path segments without a remaining-length boundary, it reads beyond the end of the stack receive buffer.
INFO
Published Date :
July 13, 2026, 10:16 p.m.
Last Modified :
Aug. 11, 2026, 4:26 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 OpENer to a fixed version.
- Patch the affected CIP message parsing logic.
- Validate EPath size against buffer limits.
- Sanitize malformed explicit requests.
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-2026-51541.
| URL | Resource |
|---|---|
| https://gist.github.com/MrAlaskan/705c680856e48c535148265c0899ad4b | Third Party Advisory |
| https://github.com/EIPStackGroup/OpENer/issues/582 | Exploit Issue Tracking Vendor Advisory |
| https://github.com/EIPStackGroup/OpENer/issues/582 | 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-2026-51541 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-2026-51541
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-2026-51541 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-51541 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/705c680856e48c535148265c0899ad4b Types: Third Party Advisory Added Reference Type MITRE: https://github.com/EIPStackGroup/OpENer/issues/582 Types: Exploit, Issue Tracking, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/EIPStackGroup/OpENer/issues/582 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-125 Added Reference https://github.com/EIPStackGroup/OpENer/issues/582 Added SSVC {'id': 'CVE-2026-51541', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-14T13:06:50.547479Z'} -
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 OpENer 2.3.0 (commit 76b95cf) has an out-of-bounds read issue in CIP message parsing when handling malformed explicit requests with a forged EPath size. An attacker can send a valid ENIP SendRRData frame carrying a very short CIP payload whose path_size field claims that many more path words are present than are actually available. Because the parser trusts the attacker-controlled path_size and continues decoding path segments without a remaining-length boundary, it reads beyond the end of the stack receive buffer. Added Reference https://gist.github.com/MrAlaskan/705c680856e48c535148265c0899ad4b Added Reference https://github.com/EIPStackGroup/OpENer/issues/582