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CVE-2026-109618

9.8, critical

PHP Group PHP Use-After-Free Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
5% higher than 92.5% of scored CVEs
Exploitation
No public evidence
Published
21 Oct 20262 days ago

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).

Details

Vendor
PHP Group
Product
PHP
Weakness
CWE-416 (opens in a new tab)
Status
Analyzed
Updated
22 Oct 2026
Assigner
security@php.net

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References 3

Advisories 3

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other PHP Group CVEs

Every PHP Group CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2024-4577 PHP-CGI OS Command Injection Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2026-109619 PHP Group PHP Use-After-Free Vulnerability EPSS 6% 8.1, high

Beyond this page

Is CVE-2026-109618 in your network?

This page tells you how dangerous CVE-2026-109618 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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    Find it before attackers do

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 23 Oct 2026, not the live upstream state.