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Security tracker

CVE-2026-109619: PHP Stale Internal Request-State Vulnerability

In short

PHP Group PHP has a weakness classified as use after free (CWE-416). CISA added it to its Known Exploited Vulnerabilities catalog on 2026-10-26. NVD lists CVSS 4.0 at 9.2 CRITICAL.

What it is

“PHP contains a stale internal request-state vulnerability that allows for unauthenticated remote code execution.” — CISA KEV, retrieved 2026-11-01
“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. Subsequent requests may read or branch on this stale state before it is fully initialized. Multiple strategies can trigger this condition and produce remote code execution (RCE).” — NVD, retrieved 2026-11-01

Who is affected

PHP Group PHP. NVD lists the following versions as affected:

  • PHP PHP: from 5.4.0 inclusive, before 8.2.35
  • PHP PHP: from 8.3.0 inclusive, before 8.3.36
  • PHP PHP: from 8.4.0 inclusive, before 8.4.27
  • PHP PHP: from 8.5.0 inclusive, before 8.5.12
  • Siemens Ruggedcom ape1808 Firmware: all versions listed (no range given)
  • Paloaltonetworks PAN-OS: from 10.2.0 inclusive, before 10.2.7
  • Paloaltonetworks PAN-OS: version 10.2.7
  • Paloaltonetworks PAN-OS: version 10.2.8
  • Paloaltonetworks PAN-OS: version 10.2.9
  • Paloaltonetworks PAN-OS: version 10.2.10
  • Paloaltonetworks PAN-OS: version 10.2.11
  • Paloaltonetworks PAN-OS: version 10.2.12
  • Paloaltonetworks PAN-OS: version 10.2.13
  • Paloaltonetworks PAN-OS: version 10.2.14
  • Paloaltonetworks PAN-OS: version 10.2.15
  • Paloaltonetworks PAN-OS: version 10.2.16
  • Paloaltonetworks PAN-OS: version 10.2.17
  • Paloaltonetworks PAN-OS: version 10.2.18
  • Paloaltonetworks PAN-OS: from 11.1.0 inclusive, before 11.1.4
  • Paloaltonetworks PAN-OS: version 11.1.4
  • Paloaltonetworks PAN-OS: version 11.1.5
  • Paloaltonetworks PAN-OS: version 11.1.6
  • Paloaltonetworks PAN-OS: version 11.1.7
  • Paloaltonetworks PAN-OS: version 11.1.8
  • Paloaltonetworks PAN-OS: version 11.1.9
  • Paloaltonetworks PAN-OS: version 11.1.10
  • Paloaltonetworks PAN-OS: version 11.1.11
  • Paloaltonetworks PAN-OS: version 11.1.12
  • Paloaltonetworks PAN-OS: version 11.1.13
  • Paloaltonetworks PAN-OS: version 11.1.14
  • Paloaltonetworks PAN-OS: version 11.1.15
  • Paloaltonetworks PAN-OS: version 11.1.16
  • Paloaltonetworks PAN-OS: from 11.2.0 inclusive, before 11.2.4
  • Paloaltonetworks PAN-OS: version 11.2.4
  • Paloaltonetworks PAN-OS: version 11.2.5
  • Paloaltonetworks PAN-OS: version 11.2.6
  • Paloaltonetworks PAN-OS: version 11.2.7
  • Paloaltonetworks PAN-OS: version 11.2.8
  • Paloaltonetworks PAN-OS: version 11.2.9
  • Paloaltonetworks PAN-OS: version 11.2.10
  • Paloaltonetworks PAN-OS: version 11.2.11
  • Paloaltonetworks PAN-OS: version 11.2.12
  • Paloaltonetworks PAN-OS: version 11.2.13
  • Paloaltonetworks PAN-OS: version 11.2.15
  • Paloaltonetworks PAN-OS: version 11.2.16
  • Paloaltonetworks PAN-OS: from 12.1.0 inclusive, before 12.1.4
  • Paloaltonetworks PAN-OS: version 12.1.4
  • Paloaltonetworks PAN-OS: version 12.1.5
  • Paloaltonetworks PAN-OS: version 12.1.6
  • Paloaltonetworks PAN-OS: version 12.1.7
  • Paloaltonetworks PAN-OS: version 12.1.8
  • Paloaltonetworks PAN-OS: version 12.1.9
  • Paloaltonetworks PAN-OS: version 12.1.10
  • Paloaltonetworks PAN-OS: from 12.2.0 inclusive, before 12.2.4
  • Paloaltonetworks PAN-OS: version 12.2.4
  • Paloaltonetworks PAN-OS: all versions listed (no range given)
  • Paloaltonetworks Panorama Virtual Appliance: all versions listed (no range given)

Exploitation status

CISA KEV added: 2026-10-26. Known ransomware campaign use: Not reported by CISA. Due date CISA set for US federal civilian agencies: 2026-10-29.

Scores

NVD CVSS 4.0: 9.2 CRITICAL; vector CVSS: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; source [email protected].

EPSS by FIRST: 100.00%; percentile 100.00; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-416, CWE-755, CWE-824, CWE-1325, CWE-1419.

Timeline

Source events
DateEvent
2026-10-21T14:17:09.823NVD published
2026-10-26CISA KEV added
2026-10-29CISA KEV due
2026-10-30T19:18:07.753NVD last modified
2026-10-31FIRST EPSS score

CISA required action

“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.” — CISA KEV

What to do

  • Confirm whether you run PHP Group PHP and which version.
  • Apply the vendor update or mitigation in the advisory.
  • Follow CISA’s required action.
  • Review the vendor guidance on signs of compromise.
  • Track the fix through completion.

References

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.

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