CVE-2026-109618
PHP Memory Corruption Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-10-26. Federal due date: 2026-10-29.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Public exploit code
Working exploit or proof of concept code has been published for this vulnerability. Treat unpatched systems as at risk.
- PHP2Shell (CVE-2026-109618) - PHP core versions after v5.4 - RCE2026-10-22 · remote · php · Verified
Impact
PHP contains an out-of-memory corruption vulnerability that allows for unauthenticated remote code execution.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Php | Php | from 7.3.0 before 8.2.35 from 8.3.0 before 8.3.36 from 8.4.0 before 8.4.27 from 8.5.0 before 8.5.12 |
| Siemens | Ruggedcom Ape1808 Firmware | All versions |
| Paloaltonetworks | Pan-Os | from 10.2.0 before 10.2.7 Versions 10.2.7, 10.2.8, 10.2.9, 10.2.10, 10.2.11 |
| Paloaltonetworks | Panorama Virtual Appliance | All versions |
| Siemens | Blueplanet 360 Nx3 M6 Wm Od Iisx Firmware | All versions |
| Siemens | Blueplanet 360 Nx3 M6 Wm Od Iisx-S Firmware | All versions |
| Siemens | Energy Engage | Versions 2.0, 3.1 |
| Siemens | Spectrum Power 4 | All versions |
| Siemens | Spectrum Power 7 | All versions |
| Siemens | Spectrum Power Tg | All versions |
| Siemens | Amis Ts | All versions |
Weakness classification
References
- NVD record
- CVE.org record
- CISA KEV catalog
- https://github.com/php/php-src/security/advisories/GHSA-w8hw-w9fx-j79w
- http://seclists.org/fulldisclosure/2026/Oct/51
- http://www.openwall.com/lists/oss-security/2026/10/21/6
- http://www.openwall.com/lists/oss-security/2026/10/23/5
- https://arcticwolf.com/resources/blog/php2shell-critical-php-vulnerabilities-enable-unauthenticated-remote-code-execution/
- https://cert-portal.siemens.com/productcert/html/ssa-166980.html
- https://cert-portal.siemens.com/productcert/html/ssa-566435.html
- https://cert-portal.siemens.com/productcert/html/ssa-566512.html
- https://php2shell.delftintellab.com
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-109618
- https://www.wiz.io/blog/php2shell-php-rce