CVE-2026-109618

● Known-exploited CRITICAL ⚠ Exploit

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...

Affects 0 products across 5 vendors.

CVSS 3.19.8
CVSS v49.2
EPSS100.0%
Percentile100th
PatchUnknown
Known-exploited since2026-10-26
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-416: Use After Free

Software references memory after it has been freed, leading to corruption, crashes, or code execution.

CWE-755: CWE-755
CWE-824: CWE-824
CWE-1325: CWE-1325
Related Attack Patterns (CAPEC)
CAPEC-130 Excessive Allocation
via CWE-1325

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ AI Analysis — automated analysis, not human-reviewed

A critical severity vulnerability (CVE-2026-109618) affects the target system. 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 allocati...

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Frequently Asked Questions
What is CVE-2026-109618?
A critical severity vulnerability (CVE-2026-109618) affects the target system. 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 allocati...
What is the CVSS score for CVE-2026-109618?
CVE-2026-109618 has CVSS 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 100.0%.
Is CVE-2026-109618 actively exploited?
Yes. CVE-2026-109618 is in the CISA known-exploited catalog (added 2026-10-26). Active exploitation confirmed. Immediate patching required.
How do I remediate CVE-2026-109618?
Apply vendor patches for CVE-2026-109618. Monitor Cisco, Fortinet advisories.
What systems are affected by CVE-2026-109618?
CVE-2026-109618 affects Cisco; Fortinet; Johnsoncontrols; Palo Alto Networks; Siemens.
Vulnerability Details
CVE IDCVE-2026-109618
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2026-10-21
Last Modified2026-11-02
ICS Relevance85%
Weakness (CWE)
SourceNVD
Official 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).

Source: NIST NVD / MITRE CVE Database

Affected Products
VendorProductAffected Versions
Cisco — —
Fortinet — —
Johnsoncontrols — —
Palo Alto Networks — —
Siemens — —
Palo Alto Networks Pan-Os 10.2.7 10.2.8 10.2.9 10.2.10 10.2.11 10.2.12
+44 more10.2.13 10.2.14 10.2.15 10.2.16 10.2.17 10.2.18 11.1.4 11.1.5 11.1.6 11.1.7 11.1.8 11.1.9 11.1.10 11.1.11 11.1.12 11.1.13 11.1.14 11.1.15 11.1.16 11.2.4 11.2.5 11.2.6 11.2.7 11.2.8 11.2.9 11.2.10 11.2.11 11.2.12 11.2.13 11.2.15 11.2.16 12.1.4 12.1.5 12.1.6 12.1.7 12.1.8 12.1.9 12.1.10 12.2.4 ≥ 10.2.0, < 10.2.7 ≥ 11.1.0, < 11.1.4 ≥ 11.2.0, < 11.2.4 ≥ 12.1.0, < 12.1.4 ≥ 12.2.0, < 12.2.4
Php Php ≥ 7.3.0, < 8.2.35 ≥ 8.3.0, < 8.3.36 ≥ 8.4.0, < 8.4.27 ≥ 8.5.0, < 8.5.12
Siemens Energy Engage 2.0 3.1
Remediation

No official vendor advisory link on record. See the CVE record →

Threat Intelligence
● Threat Intelligence Validated: November 2026 | Threat Age: 13 Days
CISA known-exploited● Active Exploitation Confirmed (added 2026-10-26)
Public Exploit⚠ Available — Reference
PoC CodeNot confirmed
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This Vulnerability Is Being Actively Exploited

CVE-2026-109618 is on the CISA known-exploited list - confirmed active exploitation in the wild. BreachSpider flags known-exploited CVEs on the ICS assets they affect, with known-exploited status synced daily from CISA.

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