CVE-2026-71268 — OpenPLC Runtime v3 Path Traversal in Structured Text FILE Directive Leading to Arbitrary File Write

CVE-2026-71268

OpenPLC Runtime v3 Path Traversal in Structured Text FILE Directive Leading to Arbitrary File Write PUBLISHED

Description (CNA)

OpenPLC Runtime v3's compile_program function (webserver/openplc.py) parses directives from uploaded Structured Text (.st) program files and writes the referenced content to with no validation that file_path stays within the ./core directory. A path-validation function, validate_file_path, exists elsewhere in the codebase (webserver/credentials.py) but is never invoked from compile_program, leaving the sink unprotected.

Affected (CNA)

Vendor / product	Versions
thiagoralves / OpenPLC_v3	affected 0 through *

CWE

CWE-22

References

https://github.com/thiagoralves/OpenPLC_v3
https://github.com/thiagoralves/OpenPLC_v3/blob/master/webserver/openplc.py

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.