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CVE-2026-109618

RCE via OOM corruption

  • Critical 9.2
  • Exploited: added to CISA KEV 26 Oct 2026

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).

Key facts

Published
21 Oct 2026
Last changed
15 Nov 2026
Assigned by
php
KEV added
26 Oct 2026
KEV fix due
29 Oct 2026
EPSS
99.999% likely to be exploited in the next 30 days, higher than 99.999% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.2CVSS 4.0, Criticalfrom the CNA (php)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

What to do

  • Check the GitHub Security Advisory for mitigation strategies.CNA workaround statement
  • 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.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

CAPEC-234 Hijacking a privileged process (CNA impact statement)

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
PHP GroupPHP
  • Default status: unaffected
  • 8.2.* up to but excluding 8.2.35 (affected)
  • 8.3.* up to but excluding 8.3.36 (affected)
  • 8.4.* up to but excluding 8.4.27 (affected)
  • 8.5.* up to but excluding 8.5.12 (affected)

Timeline

  1. 21 Oct 2026 Published
  2. 26 Oct 2026 CVE-2026-109618 added to CISA KEV
  3. 26 Oct 2026 Added to the CISA KEV catalogue

Weakness

Related coverage

References