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CVE-2026-109618RCE via OOM corruption

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).

9.2 CRITICALEPSS 99.99%⚡ Known Exploited (CISA KEV)NVD: Analyzed

OverviewAffected ProductsReferences
NVD CVE.org

Overview

Severity

ScoreSeverityVersionVector String
9.2CRITICAL4.0php (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
9.8CRITICAL3.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA required action

⚡ Known exploited · remediation due Oct 29, 2026

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.

Details

CVE ID
CVE-2026-109618
Status
Analyzed
Assigner (CNA)
php
Published
Oct 21, 2026
Last modified
2026-11-05 19:17 UTC
Weaknesses
  • CWE-416 · Use after free
  • CWE-755 · Improper Handling of Exceptional Conditions
  • CWE-824 · Access of uninitialized pointer
  • CWE-1325 · Improperly controlled sequential memory allocation
  • CWE-1419 · Incorrect Initialization of Resource

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 07:29 UTC.