How severe is CVE-2026-31156?

CVE-2026-31156 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-31156 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-31156?

CVE-2026-31156 affects Openplcproject Openplc V3 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-31156?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-31156 have an EU (EUVD) identifier?

Yes. CVE-2026-31156 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29960.

When was CVE-2026-31156 published?

CVE-2026-31156 was published on 2026-05-13 and last updated on 2026-07-05.

CVE-2026-31156

CVE-2026-31156 is a medium-severity vulnerability in Openplcproject Openplc V3 Firmware with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29960
Weakness: CWE-22
Affected product: Openplcproject Openplc V3 Firmware
Published: 2026-05-13
Last modified: 2026-07-05

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-31156?: CVE-2026-31156 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-31156 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-31156?: CVE-2026-31156 affects Openplcproject Openplc V3 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-31156?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-31156 have an EU (EUVD) identifier?: Yes. CVE-2026-31156 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29960.
When was CVE-2026-31156 published?: CVE-2026-31156 was published on 2026-05-13 and last updated on 2026-07-05.

References

https://github.com/unicorn-hyh/CVE-2026-31156

EU advisories (EUVD)

http://openplc.com

Affected products (1)

cpe:2.3:o:openplcproject:openplc_v3_firmware:2024-03-09:*:*:*:*:*:*:*

More vulnerabilities in Openplcproject Openplc V3 Firmware

CVE-2026-28205 — Critical (CVSS 9.8): OpenPLC_V3 is vulnerable to an Initialization of a Resource with an Insecure Default vulnerability which could allow an…
CVE-2018-20818 — Critical (CVSS 9.8): A buffer overflow vulnerability was discovered in the OpenPLC controller, in the OpenPLC_v2 and OpenPLC_v3 versions. It…
CVE-2024-34026 — Critical (CVSS 9.0): A stack-based buffer overflow vulnerability exists in the OpenPLC Runtime EtherNet/IP parser functionality of OpenPLC…
CVE-2026-35063 — High (CVSS 8.8): OpenPLC_V3 REST API endpoint checks for JWT presence but never verifies the caller's role. Any authenticated user with…
CVE-2021-31630 — High (CVSS 8.8): Command Injection in Open PLC Webserver v3 allows remote attackers to execute arbitrary code via the "Hardware Layer…
CVE-2026-35556 — High (CVSS 7.5): OpenPLC_V3 is vulnerable to a Plaintext Storage of a Password vulnerability that could allow an attacker to retrieve…

All CVEs affecting Openplcproject Openplc V3 Firmware →

Other CWE-22 (Path Traversal) vulnerabilities

CVE-2026-76606 — Critical (CVSS 10.0): Joomla Extension - fabrikar.com - Path Traversal via image element in Fabrik < 4.7.3 - ???.
CVE-2026-18051 — Critical (CVSS 10.0): The W3 Total Cache WordPress plugin before 2.10.5 does not properly validate the request path it uses to build cache…
CVE-2026-74764 — Critical (CVSS 10.0): Pandora contains a path traversal vulnerability in its TAR archive extraction functionality. When processing a…
CVE-2026-16940 — Critical (CVSS 10.0): The Custom Fields WordPress plugin before 1.5.1 does not validate a user-supplied file path before deletion, allowing…
CVE-2026-67429 — Critical (CVSS 10.0): Flyto2 Core is an execution kernel for automation and AI-agent workflows. Prior to 2.26.6, image.download and related…
CVE-2026-59555 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Deletion in Participants Database <= 2.7.8.3 versions.

Browse all CWE-22 (Path Traversal) vulnerabilities →