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Vulnerabilities in PHP: CVE-2026-109618, CVE-2026-109619 ![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) 3 min read Related Products [![Advanced Threat Prevention icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/strata_RGB_logo_Icon_Color.png)Advanced Threat Prevention](https://unit42.paloaltonetworks.com/product-category/advanced-threat-prevention/ "Advanced Threat Prevention")[![Cloud-Delivered Security Services icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/strata_RGB_logo_Icon_Color.png)Cloud-Delivered Security Services](https://unit42.paloaltonetworks.com/product-category/cloud-delivered-security-services/ "Cloud-Delivered Security Services")[![Cortex icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/cortex_RGB_logo_Icon_Color.png)Cortex](https://unit42.paloaltonetworks.com/product-category/cortex/ "Cortex")[![Cortex Cloud 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[Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/) * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-tags-grey.svg) Tags: * [CVE-2026-109618](https://unit42.paloaltonetworks.com/tag/cve-2026-109618/) * [CVE-2026-109619](https://unit42.paloaltonetworks.com/tag/cve-2026-109619/) * [![Download Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-download.svg)](https://unit42.paloaltonetworks.com/cve-2026-109618-cve-2026-109619/?pdf=download&lg=en&_wpnonce=a0d449e753 "Click here to download") * [![Print Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-print.svg)](https://unit42.paloaltonetworks.com/cve-2026-109618-cve-2026-109619/?pdf=print&lg=en&_wpnonce=a0d449e753 "Click here to print") Share![Down arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/down-arrow.svg) * ![Link 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Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-reddit-share.svg)](https://www.paloaltonetworks.com//www.reddit.com/submit?url=https%3A%2F%2Funit42.paloaltonetworks.com%2Fcve-2026-109618-cve-2026-109619%2F&ts=markdown "Share in Reddit") * [![Mastodon Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-mastodon-share.svg)](https://mastodon.social/share?text=Threat%20Brief:%20Critical%20Vulnerabilities%20in%20PHP:%20CVE-2026-109618,%20CVE-2026-109619%20https%3A%2F%2Funit42.paloaltonetworks.com%2Fcve-2026-109618-cve-2026-109619%2F "Share in Mastodon") ## Executive Summary Unit 42 is aware of two critical vulnerabilities in PHP: CVE-2026-109618 and CVE-2026-109619. Both are remote code execution (RCE) vulnerabilities rated as 9.2 (CVSS 4.0). We encourage reviewing the [PHP Group's security advisory and patching guidance](https://www.php.net/index.php). PHP is widely used across web servers and content management systems globally. We recommend assessing your exposure to these vulnerabilities and patching immediately. Unit 42 has seen proof of concept of these vulnerabilities. At least one European government has taken its website offline as a precaution. Palo Alto Networks has evaluated our product portfolio regarding this issue. Refer to our [security advisory](https://security.paloaltonetworks.com/CVE-2026-109618) for the most up to date details. * CVE-2026-109618 involves a remote code execution vulnerability where handling out-of-memory errors via longjmp() leaves request memory uninitialized due to improper control flow management, allowing attackers to reliably achieve RCE using out-of-memory (OOM) triggers. * CVE-2026-109619 describes a remote code execution vulnerability where longjmp() fatal error handling leaves global memory pointing to freed memory regions. These regions can later be read or branched on during subsequent requests, enabling attackers to execute arbitrary code. At the time of publication, Palo Alto Networks [Cortex Xpanse](https://docs-cortex.paloaltonetworks.com/p/XPANSE) has identified the presence of over 22.6 million exposed instances potentially vulnerable to CVE-2026-109618 and CVE-2026-109619 based on our telemetry. Palo Alto Networks customers receive protections from and mitigations for CVE-2026-109618 and CVE-2026-109619 in the following ways: * [Cortex XDR](https://docs-cortex.paloaltonetworks.com/p/XDR) and [XSIAM](https://docs-cortex.paloaltonetworks.com/p/XSIAM) * [Cortex Cloud](https://cortex-docs.paloaltonetworks.com/cortex-cloud-docs) * [Cortex Xpanse](https://docs-cortex.paloaltonetworks.com/p/XPANSE) * [Advanced Threat Prevention Plus with Frontier Virtual Patching](https://www.paloaltonetworks.com/blog/network-security/harnessing-ai-for-prevention-introducing-frontier-virtual-patching/) * [Advanced Threat Prevention](https://www.paloaltonetworks.com/network-security/advanced-threat-prevention) Palo Alto Networks also recommends assessing your exposure to these vulnerabilities and patching immediately. Organizations can access tailored adversary intelligence, direct analyst consultations, and specialized exposure tracking through[Unit 42 Threat Intel Services](https://www.paloaltonetworks.com/unit42/threat-intelligence) and our[Deep and Dark Web Service](https://www.paloaltonetworks.com/resources/datasheets/unit-42-deep-and-dark-web-service). The [Unit 42 Incident Response team](https://start.paloaltonetworks.com/contact-unit42.html) can also be engaged to help with a compromise or to provide a proactive assessment to lower your risk. |-------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------| | **Vulnerabilities Discussed** | [**CVE-2026-109618**](https://unit42.paloaltonetworks.com/tag/CVE-2026-109618/), [**CVE-2026-109619**](https://unit42.paloaltonetworks.com/tag/CVE-2026-109619/) | ## Palo Alto Networks Product Protections for CVE-2026-109618 and CVE-2026-109619 Palo Alto Networks customers can leverage several product protections and updates to identify and defend against these vulnerabilities. Organizations can access tailored adversary intelligence, direct analyst consultations, and specialized exposure tracking through [Unit 42 Threat Intel Services](https://www.paloaltonetworks.com/unit42/threat-intelligence) and its[Deep and Dark Web Service](https://www.paloaltonetworks.com/resources/datasheets/unit-42-deep-and-dark-web-service). If you think you might have been compromised or have an urgent matter, get in touch with the [Unit 42 Incident Response team](https://start.paloaltonetworks.com/contact-unit42.html) or call: * North America: Toll Free: +1 (866) 486-4842 (866.4.UNIT42) * UK: +44.20.3743.3660 * Europe and Middle East: +31.20.299.3130 * Asia: +65.6983.8730 * Japan: +81.50.1790.0200 * Australia: +61.2.4062.7950 * India: 000 800 050 45107 * South Korea: +82.080.467.8774 ### Cortex XDR, Cortex Cloud and XSIAM [Cortex XDR,](https://docs-cortex.paloaltonetworks.com/p/XDR)[Cortex Cloud](https://cortex-docs.paloaltonetworks.com/cortex-cloud-runtime-security) and [XSIAM](https://docs-cortex.paloaltonetworks.com/p/XSIAM) help protect against post-exploitation activities using the multi-layer protection approach. ### Cortex Cloud and Prisma Cloud [Cortex Cloud](https://cortex-docs.paloaltonetworks.com/cortex-cloud-posture-management/vunerability-management/vulnerability-management-in-cortex-cloud) and [Prisma Cloud](https://docs.prismacloud.io/) help detect vulnerable PHP versions in code and cloud environments providing both posture and vulnerability protections. ### Cortex Xpanse [Cortex Xpanse](https://docs-cortex.paloaltonetworks.com/p/XPANSE) can identify exposed devices on the public internet and escalate these findings to defenders. Customers can enable alerting on this risk by ensuring that the PHP Attack Surface Rule is enabled. Identified findings can either be viewed in the Threat Response Center or in the incident view of Expander. These findings are also available for Cortex XSIAM customers who have purchased the ASM module. ### Next-Generation Firewall Next-Generation Firewall with the following security subscriptions can help block the attacks: * [Advanced Threat Prevention Plus with Frontier Virtual Patching](https://www.paloaltonetworks.com/blog/network-security/harnessing-ai-for-prevention-introducing-frontier-virtual-patching/) since 10:21 p.m. PT on October 20, 2026, via Threat ID [543004](https://threatvault.paloaltonetworks.com/?query=543004). ## Additional Resources * [Impact of Critical Vulnerabilities in PHP on Palo Alto Networks Products](https://security.paloaltonetworks.com/CVE-2026-109618) --- Advisory, Palo Alto Networks * [Millions of PHP Instances Exposed: What Organizations Need To Do Right Now](https://www.paloaltonetworks.com/blog/2026/10/millions-of-php-instances-exposed-what-organizations-need-to-do-right-now/) --- Lee Klarich, Palo Alto Networks * [Security advisory: Critical remote code execution vulnerabilities, update now](https://www.php.net/archive/2026.php#2026-10-21-5) - PHP *Updated October 21, 2026, at 9:30 a.m. PT to add Palo Alto Networks security advisory, update links in additional resources, and update product protection section.* *Updated October 21, 2026, at 1:00 p.m. PT to update the product protection section.* Back to top ### Tags * [CVE-2026-109618](https://unit42.paloaltonetworks.com/tag/cve-2026-109618/ "CVE-2026-109618") * [CVE-2026-109619](https://unit42.paloaltonetworks.com/tag/cve-2026-109619/ "CVE-2026-109619") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: "Next Exploit Opportunities": How a Threat Actor Used AI to Help Plan and Execute Multiple Types of Cybercrime Activities](https://unit42.paloaltonetworks.com/ai-assisted-cybercrime-analysis/ "“Next Exploit Opportunities”: How a Threat Actor Used AI to Help Plan and Execute Multiple Types of Cybercrime Activities") ### Table of Contents * ### Related Articles ## Related Vulnerabilities Resources ![Pictorial representation of PAN-OS CVE-2026-0257. 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Digital illustration of a map of North America with interconnected glowing lines and dots symbolizing network connections across the continent.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/05/06_Vulnerabilities_1920x900-3-1-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) May 6, 2026 [#### Threat Brief: Exploitation of PAN-OS Captive Portal Zero-Day for Unauthenticated Remote Code Execution](https://unit42.paloaltonetworks.com/captive-portal-zero-day/) * [CVE-2026-0300](https://unit42.paloaltonetworks.com/tag/cve-2026-0300/ "CVE-2026-0300") * [EarthWorm](https://unit42.paloaltonetworks.com/tag/earthworm/ "EarthWorm") * [PAN-OS](https://unit42.paloaltonetworks.com/tag/pan-os/ "PAN-OS") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/captive-portal-zero-day/ "Threat Brief: Exploitation of PAN-OS Captive Portal Zero-Day for Unauthenticated Remote Code Execution") ![Pictorial representation of a severe Linux vulnerability. Close-up of a woman wearing glasses and focusing intently on a computer screen.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/05/05_Vulnerabilities_1920x900-2-1-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) May 5, 2026 [#### Copy Fail: What You Need to Know About the Most Severe Linux Threat in Years](https://unit42.paloaltonetworks.com/cve-2026-31431-copy-fail/) * [Containers](https://unit42.paloaltonetworks.com/tag/containers/ "Containers") * [CVE-2026-31431](https://unit42.paloaltonetworks.com/tag/cve-2026-31431/ "CVE-2026-31431") * [Kubernetes](https://unit42.paloaltonetworks.com/tag/kubernetes/ "Kubernetes") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/cve-2026-31431-copy-fail/ "Copy Fail: What You Need to Know About the Most Severe Linux Threat in Years") ![Pictorial representation of CVE-2023-33538. Abstract image of a glowing red Wi-Fi symbol on a circuit board, with intricate patterns and a futuristic appearance.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/04/04_Vulnerabilities_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) April 16, 2026 [#### A Deep Dive Into Attempted Exploitation of CVE-2023-33538](https://unit42.paloaltonetworks.com/exploitation-of-cve-2023-33538/) * [Botnet](https://unit42.paloaltonetworks.com/tag/botnet/ "botnet") * [Command injection](https://unit42.paloaltonetworks.com/tag/command-injection/ "Command injection") * [CVE-2023-33538](https://unit42.paloaltonetworks.com/tag/cve-2023-33538/ "CVE-2023-33538") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/exploitation-of-cve-2023-33538/ "A Deep Dive Into Attempted Exploitation of CVE-2023-33538") ![Pictorial representation of BeyondTrust vulnerability CVE-2026-1731. Digital art depicting a stylized mountain range with vibrant blue and red hues. The peaks are accentuated by glowing particles and an abstract, starry backdrop, creating a futuristic landscape.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/02/14_Overview_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) February 19, 2026 [#### VShell and SparkRAT Observed in Exploitation of BeyondTrust Critical Vulnerability (CVE-2026-1731)](https://unit42.paloaltonetworks.com/beyondtrust-cve-2026-1731/) * [Bash](https://unit42.paloaltonetworks.com/tag/bash/ "bash") * [CVE-2026-1731](https://unit42.paloaltonetworks.com/tag/cve-2026-1731/ "CVE-2026-1731") * [PowerShell](https://unit42.paloaltonetworks.com/tag/powershell/ "PowerShell") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/beyondtrust-cve-2026-1731/ "VShell and SparkRAT Observed in Exploitation of BeyondTrust Critical Vulnerability (CVE-2026-1731)") * ![Slider arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/slider-arrow-left.svg) * ![Slider arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/slider-arrow-left.svg) ![Close button](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/close-modal.svg) ![Enlarged Image]() ![Newsletter](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/03/unit42-footer-subscribe-desktop.png) ![UNIT 42 Small Logo](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/palo-alto-logo-small.svg) Get updates from Unit 42 ## Peace of mind comes from staying ahead of threats. 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