Path Traversal in Openplcproject Openplc V3
CVE-2026-31156
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (38.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Openplcproject Openplc V3
- Openplcproject Openplc V3 Firmware — versions 2024-03-09
Weakness classification (CWE)
Public proof-of-concept exploits
References
- openplc.com (Product)
- github.com/unicorn-hyh/CVE-2026-31156 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-31156?
- CVE-2026-31156 is a medium-severity vulnerability in Openplcproject Openplc V3, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-05-13.
- How severe is CVE-2026-31156?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2026-31156 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.