CVE-2026-31156
OpenPLC Path Injection Vulnerability
Description
A path injection vulnerability exists in OpenPLC v3 (2c82b0e79c53f8c1f1458eee15fec173400d6e1a) as the binary program compiled from glue_generator.cpp does not perform any validation on the file path parameters passed via the command line. The user-controlled input parameters are directly passed to the underlying file operation functions (fopen/ifstream/ofstream) for file reading and writing. An attacker can exploit this vulnerability by constructing a malicious path to read arbitrary readable files.
INFO
Published Date :
May 13, 2026, 4:16 p.m.
Last Modified :
May 26, 2026, 3:13 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-31156
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Sanitize all file path inputs.
- Validate input paths against allowed directories.
- Restrict file access permissions.
- Update the application to a secure version.
Public PoC/Exploit Available at Github
CVE-2026-31156 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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-2026-31156.
| URL | Resource |
|---|---|
| http://openplc.com | Product |
| https://github.com/unicorn-hyh/CVE-2026-31156 | Exploit Third Party Advisory |
| https://github.com/unicorn-hyh/CVE-2026-31156 | Exploit Third Party 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-2026-31156 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-2026-31156
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).
There is a path injection vulnerability in OpenPLC-v3, which arises from the program not performing any validity checks on the file path parameters passed in from the command line. Attackers can read any readable file by constructing malicious paths, posing a risk of information leakage.
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-31156 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-31156 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]
May. 26, 2026
Action Type Old Value New Value Added CPE Configuration AND OR *cpe:2.3:o:openplcproject:openplc_v3_firmware:2024-03-09:*:*:*:*:*:*:* OR cpe:2.3:h:openplcproject:openplc_v3:-:*:*:*:*:*:*:* Added Reference Type MITRE: http://openplc.com Types: Product Added Reference Type CISA-ADP: https://github.com/unicorn-hyh/CVE-2026-31156 Types: Exploit, Third Party Advisory Added Reference Type MITRE: https://github.com/unicorn-hyh/CVE-2026-31156 Types: Exploit, Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 14, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-22 Added Reference https://github.com/unicorn-hyh/CVE-2026-31156 -
New CVE Received by [email protected]
May. 13, 2026
Action Type Old Value New Value Added Description A path injection vulnerability exists in OpenPLC v3 (2c82b0e79c53f8c1f1458eee15fec173400d6e1a) as the binary program compiled from glue_generator.cpp does not perform any validation on the file path parameters passed via the command line. The user-controlled input parameters are directly passed to the underlying file operation functions (fopen/ifstream/ofstream) for file reading and writing. An attacker can exploit this vulnerability by constructing a malicious path to read arbitrary readable files. Added Reference http://openplc.com Added Reference https://github.com/unicorn-hyh/CVE-2026-31156