Critical 9.2Known exploited (CISA KEV)Published Oct 21, 2026

CVE-2026-109618RCE via OOM corruption

Updated under an hour ago (Oct 28, 2026, 12:00 PM ET)

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It affects PHP Group PHP and 5 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Oct 26, 2026; federal agencies must remediate by Oct 29, 2026. Treat that date as your deadline.

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Every CVE for PHP Group PHP

Exploited in the last 30 days

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).

CVSS: 9.2 CRITICAL (v4.0, CNA)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
Weakness (CWE): CWE-416, CWE-755, CWE-824, CWE-1325, CWE-1419
Known exploited: Added to CISA KEV Oct 26, 2026; federal remediation due Oct 29, 2026Apply 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.
EPSS (exploitation in the next 30 days): 100.00% (percentile 100)
Assigned by: php
NVD analysis: Analyzed
Record last updated: Oct 27, 2026
First seen by InfoSec Signals: Oct 21, 2026

Affected products

Affected products

PHP Group PHP php_group:php (from the name)	from 8.2.* before 8.2.35; from 8.3.* before 8.3.36; from 8.4.* before 8.4.27; from 8.5.* before 8.5.12	CNA record
Siemens RUGGEDCOM APE1808 siemens:ruggedcom_ape1808 (from the name)	all versions	CISA ADP
php php 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	NVD
siemens ruggedcom_ape1808_firmware siemens:ruggedcom_ape1808_firmware	all versions	NVD
paloaltonetworks pan-os paloaltonetworks:pan-os	from 10.2.0 before 10.2.7; 10.2.7; 10.2.7; 10.2.7; 10.2.7; 10.2.7; 10.2.7; 10.2.7; and 193 more ranges	NVD
paloaltonetworks panorama_virtual_appliance paloaltonetworks:panorama_virtual_appliance	all versions	NVD

References

References

https://github.com/php/php-src/security/advisories/GHSA-w8hw-w9fx-j79w	vendor-advisory, mitigation
http://www.openwall.com/lists/oss-security/2026/10/21/6	mailing-list, third-party-advisory
http://www.openwall.com/lists/oss-security/2026/10/23/5	mailing-list, third-party-advisory
https://arcticwolf.com/resources/blog/php2shell-critical-php-vulnerabilities-enable-unauthenticated-remote-code-execution/	third-party-advisory
https://cert-portal.siemens.com/productcert/html/ssa-566512.html	third-party-advisory
https://php2shell.delftintellab.com	third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-109618	us-government-resource
https://www.wiz.io/blog/php2shell-php-rce	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.