What is CVE-2026-71268?

CVE-2026-71268 is a critical-severity vulnerability in Thiagoralves Openplc V3, classified under Path Traversal. CVSS score: 9.9/10. Published 2026-08-05.

How severe is CVE-2026-71268?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Path Traversal in Thiagoralves Openplc V3

CVE-2026-71268

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.

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.004 (30.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Thiagoralves Openplc_v3 — versions 0

Weakness classification (CWE)

CWE-22 — Path Traversal

References

309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)
309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)

Frequently asked questions

What is CVE-2026-71268?: CVE-2026-71268 is a critical-severity vulnerability in Thiagoralves Openplc V3, classified under Path Traversal. CVSS score: 9.9/10. Published 2026-08-05.
How severe is CVE-2026-71268?: Critical severity. CVSS v3 base score is 9.9 out of 10.