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CVE-2026-109618

9.8 · CRITICALActively Exploited

PHP uses longjmp() for out-of-memory (OOM) errors to exit the current context and abort handling of the request.

Published Oct 21, 2026phpCWE-416EPSS 100.00%

Overview

CVE-2026-109618 is a critical-severity vulnerability affecting php php. It was published on October 21, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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).

Remediation

Check the references section for vendor advisories and patches from php. Update php to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
phpphp>= 7.3.0, < 8.2.35Affected
paloaltonetworkspan-os>= 10.2.0, < 10.2.7Affected

References

GitHubgithub.com/php/php-src/security/advisories/GHSA-w8hw-w9fx-j79wRefseclists.org/fulldisclosure/2026/Oct/51Refwww.openwall.com/lists/oss-security/2026/10/21/6Refwww.openwall.com/lists/oss-security/2026/10/23/5Refarcticwolf.com/resources/blog/php2shell-critical-php-vulnerabilities-enable-unauthenticated-remote-code-execution/Refcert-portal.siemens.com/productcert/html/ssa-166980.htmlRefcert-portal.siemens.com/productcert/html/ssa-566435.htmlRefcert-portal.siemens.com/productcert/html/ssa-566512.htmlRefphp2shell.delftintellab.comCISAwww.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-109618

How CyberStrike helps

Frequently asked questions

What is CVE-2026-109618?

CVE-2026-109618 is a critical-severity vulnerability affecting php php. It was published on October 21, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2026-109618?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-109618?

Check the references section for vendor advisories and patches from php. Update php to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-109618?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-109618 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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