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2 vulnerabilities found for OpenPLC_v3 by openplcproject
CVE-2026-11826 (GCVE-0-2026-11826)
Vulnerability from nvd – Published: 2026-07-18 13:35 – Updated: 2026-07-20 17:45
VLAI
EPSS
VEX
Title
OpenPLC_v3 Heap-Based Buffer Overflow in Modbus Master getData()
Summary
OpenPLC_v3 contains a heap-based buffer overflow in the getData() function in webserver/core/modbus_master.cpp. getData() reads characters between two delimiters into a caller-supplied buffer with no size parameter and no bounds check. In parseConfig() the function is invoked with the 100-byte heap-allocated MB_device.dev_name field. An authenticated attacker with access to the OpenPLC web interface can send a crafted HTTP POST to the /modbus endpoint with an oversized device_name value; the value is persisted to mbconfig.cfg and parsed on load, overflowing dev_name and overwriting adjacent struct fields (protocol at offset 108, dev_address at offset 109, ip_port at offset 210). A 200-byte payload writes 100 bytes past the allocation. The result is heap corruption leading to runtime crash and denial of service of the PLC process control loop, with attacker-controlled overwrite of adjacent configuration fields. The upstream repository was archived on 2026-04-04 and no fix is expected; the vendor has confirmed the issue does not affect OpenPLC Runtime v4.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://gist.github.com/Shukhrat-03/5cf1825b72e48… | technical-description |
| https://github.com/thiagoralves/OpenPLC_v3/commit… | patch |
| https://github.com/thiagoralves/OpenPLC_v3 | product |
| https://www.vulncheck.com/advisories/openplc-v3-h… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| openplcproject | OpenPLC_v3 |
Affected:
0 , ≤ b470206
(git)
|
Date Public
2026-07-17 00:00
Credits
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CVE-2026-11826 (GCVE-0-2026-11826)
Vulnerability from cvelistv5 – Published: 2026-07-18 13:35 – Updated: 2026-07-20 17:45
VLAI
EPSS
VEX
Title
OpenPLC_v3 Heap-Based Buffer Overflow in Modbus Master getData()
Summary
OpenPLC_v3 contains a heap-based buffer overflow in the getData() function in webserver/core/modbus_master.cpp. getData() reads characters between two delimiters into a caller-supplied buffer with no size parameter and no bounds check. In parseConfig() the function is invoked with the 100-byte heap-allocated MB_device.dev_name field. An authenticated attacker with access to the OpenPLC web interface can send a crafted HTTP POST to the /modbus endpoint with an oversized device_name value; the value is persisted to mbconfig.cfg and parsed on load, overflowing dev_name and overwriting adjacent struct fields (protocol at offset 108, dev_address at offset 109, ip_port at offset 210). A 200-byte payload writes 100 bytes past the allocation. The result is heap corruption leading to runtime crash and denial of service of the PLC process control loop, with attacker-controlled overwrite of adjacent configuration fields. The upstream repository was archived on 2026-04-04 and no fix is expected; the vendor has confirmed the issue does not affect OpenPLC Runtime v4.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://gist.github.com/Shukhrat-03/5cf1825b72e48… | technical-description |
| https://github.com/thiagoralves/OpenPLC_v3/commit… | patch |
| https://github.com/thiagoralves/OpenPLC_v3 | product |
| https://www.vulncheck.com/advisories/openplc-v3-h… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| openplcproject | OpenPLC_v3 |
Affected:
0 , ≤ b470206
(git)
|
Date Public
2026-07-17 00:00
Credits
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