Summary
Helmholz myREX24V2/myREX24V2.virtual ships with a bundled PHP version that is affected by two vulnerabilities known as "php2shell".
Details
Impact
Both vulnerabilities can lead to unauthenticated remote code execution (RCE) resulting in a total loss of confidentiality, integrity and availability.
Remediation
Update the myREX24V2/myREX24V2.virtual instance to version 2.21.6.
Vulnerabilities 2
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Critical 9.2
RCE via OOM corruption
PHP uses longjmp() for out-of-memory (OOM) errors to exit the current context and abort handling of the request. Some contexts may not properly account for this scenario and leave request memory in an uninitialized state before performing an allocation. The s…
KEV Oct 26, 2026 -
Critical 9.2
RCE via stale global state
PHP has various global state that temporarily points into request memory. In some scenarios, global state may not be correctly reset, or may be repopulated after being reset. The global state may then refer to request memory even after it has been freed. Subs…
KEV Oct 26, 2026
Revision history
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#1.0.0
Initial revision.
References
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CERT@VDE Security Advisories for Helmholz
https://certvde.com/en/advisories/vendor/helmholz
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VDE-2026-160: Helmholz: php2shell in myREX24V2/myREX24V2.virtual - HTML
https://certvde.com/en/advisories/VDE-2026-160