CVE-2026-8047
Out-of-bounds Write in CODESYS Control
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.
INFO
Published Date :
May 26, 2026, 8:16 a.m.
Last Modified :
June 17, 2026, 11:03 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-8047
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 270ccfa6-a436-4e77-922e-914ec3a9685c | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | 270ccfa6-a436-4e77-922e-914ec3a9685c | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Apply vendor-supplied security patches for affected products.
- Update product firmware to the latest available version.
- Configure HTTP request handling to enforce length limits.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-8047.
| URL | Resource |
|---|---|
| https://www.certvde.com/en/advisories/VDE-2026-057/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-8047 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-8047
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-8047 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-8047 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'CODESYS', 'product': 'CODESYS Control RTE (SL)', 'versions': [{'status': 'affected', 'version': '3.5.21.0', 'lessThan': '3.5.22.20', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control RTE (for Beckhoff CX) SL', 'versions': [{'status': 'affected', 'version': '3.5.21.0', 'lessThan': '3.5.22.20', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control Win (SL)', 'versions': [{'status': 'affected', 'version': '3.5.21.0', 'lessThan': '3.5.22.20', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS HMI (SL)', 'versions': [{'status': 'affected', 'version': '3.5.21.0', 'lessThan': '3.5.22.20', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Runtime Toolkit', 'versions': [{'status': 'affected', 'version': '3.5.21.0', 'lessThan': '3.5.22.20', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for BeagleBone SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.21.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for emPC-A/iMX6 SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.21.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for IOT2000 SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.21.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for Linux ARM SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.21.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for Linux SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.21.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for PFC100 SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.21.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for PFC200 SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.21.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for PLCnext SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.21.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for Raspberry Pi SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.21.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for WAGO Touch Panels 600 SL', 'versions': [{'status': 'affected', 'version': '0.0.0', 'lessThan': '4.21.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Virtual Control SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.21.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-8047', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-26T10:45:06.909963Z'} -
New CVE Received by [email protected]
May. 26, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-1284 Added Reference https://www.certvde.com/en/advisories/VDE-2026-057/