CVE-2026-71268

criticalCVSS 9.9covered by 1 sourcefirst seen 2026-08-05

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.

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Exploitation outlook

Low exploitation risk0.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalCVE-2026-71268: OpenPLC Runtime v3's compile_program function (webserver/openplc.py) parses directives from up…nvd · 2026-08-05

External references

NVD record for CVE-2026-71268

CVE.org record

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