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Vulnerability · Published May 26, 2026 · Assigned by CERTVDE

CVE-2026-8047Out-of-bounds Write in CODESYS Control

High 7.5

In plain English

A high-severity security flaw in CODESYS Control for BeagleBone SL from CODESYS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 61.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

The affected products perform improper length checking when parsing incoming HTTP requests, resulting in a size-limited out-of-bounds write. An unauthenticated remote attacker can exploit this flaw to cause a denial of service via a system crash on the affected device.

Affected products (as reported)

VendorProductVersions
CODESYS CODESYS Control RTE (SL) 3.5.21.0 – before 3.5.22.20
CODESYS CODESYS Control RTE (for Beckhoff CX) SL 3.5.21.0 – before 3.5.22.20
CODESYS CODESYS Control Win (SL) 3.5.21.0 – before 3.5.22.20
CODESYS CODESYS HMI (SL) 3.5.21.0 – before 3.5.22.20
CODESYS CODESYS Runtime Toolkit 3.5.21.0 – before 3.5.22.20
CODESYS CODESYS Control for BeagleBone SL 4.15.0.0 – before 4.21.0.0
CODESYS CODESYS Control for emPC-A/iMX6 SL 4.15.0.0 – before 4.21.0.0
CODESYS CODESYS Control for IOT2000 SL 4.15.0.0 – before 4.21.0.0
CODESYS CODESYS Control for Linux ARM SL 4.15.0.0 – before 4.21.0.0
CODESYS CODESYS Control for Linux SL 4.15.0.0 – before 4.21.0.0
CODESYS CODESYS Control for PFC100 SL 4.15.0.0 – before 4.21.0.0
CODESYS CODESYS Control for PFC200 SL 4.15.0.0 – before 4.21.0.0
CODESYS CODESYS Control for PLCnext SL 4.15.0.0 – before 4.21.0.0
CODESYS CODESYS Control for Raspberry Pi SL 4.15.0.0 – before 4.21.0.0
CODESYS CODESYS Control for WAGO Touch Panels 600 SL 0.0.0 – before 4.21.0.0
CODESYS CODESYS Virtual Control SL 4.15.0.0 – before 4.21.0.0

Weakness: CWE-1284 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References