CVE-2026-3509 HIGH

CVE-2026-3509: CODESYS Control Audit Log Format String DoS

Vendor Codesys
Product CODESYS Control RTE (SL)
Weakness CWE-134
Published March 24, 2026
Last update March 26, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

An unauthenticated remote attacker may be able to control the format string of messages processed by the Audit Log of the CODESYS Control runtime system, potentially resulting in a denial‑of‑service (DoS) condition.

Key dates

02Disclosure timeline

March 24, 2026 CVE published
March 26, 2026 Record updated