CRITICAL · CVSS 9.2
ACTIVELY EXPLOITED
PATCH AVAILABLE
CVE-2026-109618: PHP Memory Corruption Vulnerability
| Vendor | PHP Group |
|---|---|
| Product | PHP |
| CVSS score | 9.2 · CVSS 4.0 · CRITICALCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/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 |
| EPSS | 100.0% (percentile 100) |
| Actively exploited | Yes, according to CISA KEV |
| Added to CISA KEV | 26 Oct 2026 |
| CISA federal deadline | 29 Oct 2026 |
| Weakness (CWE) | CWE-1325, CWE-1419, CWE-416, CWE-755, CWE-824 |
| NVD published | 21 Oct 2026 |
| NVD last modified | 5 Nov 2026 |
| NVD status | Analyzed |
Affected versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Paloaltonetworks Panorama Virtual Appliance | – | – |
| Php Php | from 7.3.0 before 8.2.35 | 8.2.35 |
| Php Php | from 8.3.0 before 8.3.36 | 8.3.36 |
| Php Php | from 8.4.0 before 8.4.27 | 8.4.27 |
| Php Php | from 8.5.0 before 8.5.12 | 8.5.12 |
| Siemens Amis Ts | – | – |
| Siemens Energy Engage | 2.0 | – |
| Siemens Energy Engage | 3.1 | – |
| Siemens Spectrum Power 4 | – | – |
| Siemens Spectrum Power 7 | – | – |
| Siemens Spectrum Power Tg | – | – |
| Paloaltonetworks Pan-Os | from 10.2.0 before 10.2.7 | 10.2.7 |
| Paloaltonetworks Pan-Os | from 11.1.0 before 11.1.4 | 11.1.4 |
| Paloaltonetworks Pan-Os | from 11.2.0 before 11.2.4 | 11.2.4 |
| Paloaltonetworks Pan-Os | from 12.1.0 before 12.1.4 | 12.1.4 |
| Paloaltonetworks Pan-Os | from 12.2.0 before 12.2.4 | 12.2.4 |
| Paloaltonetworks Pan-Os | – | – |
| Paloaltonetworks Pan-Os | 10.2.10 | – |
| Paloaltonetworks Pan-Os | 10.2.10 | – |
| Paloaltonetworks Pan-Os | 10.2.10 | – |
+30 more
Required action (CISA's text)
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.
Description (NVD)
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 subsequent request cleanup procedure may read or branch on this memory. Multiple OOM strategies can consistently trigger this condition and lead to remote code execution (RCE).
Vendor advisories
- Vulnerabilities in PHP Affecting Cisco Products: October 2026
- PHP2Shell core RCE vulnerability patches (CVE-2026-109618 and CVE-2026-109619)
SOURCES
Other PHP Group flaws
- CVE-2026-109619: PHP Stale Internal Request-State Vulnerability
- CVE-2024-4577: PHP-CGI OS Command Injection Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 5 Nov 2026.