Security Resilience

CVE-2026-109618

Memory Safety in Php 7.3.0 – 8.2.35

CISA KEVActive ExploitationEUVD ExploitedMemory Safety
Published
21 October 2026
Modified
02 November 2026
KEV Added
26 October 2026
Patch / advisory
View advisory
CVSS Score v4 9.2
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.99 100.0th percentile
Risk Priority 75 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). EPSS, Forum of Incident Response and Security Teams (FIRST), epss.first.org. Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-109618 is a critical-severity Use After Free (CWE-416) vulnerability in Php. Its CVSS base score is 9.2 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked in the top 0.0% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SA-15 (Development Process, Standards, and Tools) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A10:2025 Mishandling of Exceptional Conditions

EU & UK References

Vulnerability Data

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…

more

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).

CWE(s)
CWE-416CWE-755CWE-824CWE-1325
KEV Date Added
26 October 2026

Related Threats

MITRE ATT&CK Enterprise Techniques

MITRE ATT&CK v20.0

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1189 Drive-by Compromise Initial Access
Adversaries may gain access to a system through a user visiting a website over the normal course of browsing.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1499 Endpoint Denial of Service Impact
Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-109619Same product: Php Phpboth on KEV
CVE-2022-2586Shared CWE-416both on KEV
CVE-2019-0708Shared CWE-416both on KEV
CVE-2021-30633Shared CWE-416both on KEV
CVE-2022-22620Shared CWE-416both on KEV
CVE-2023-32373Shared CWE-416both on KEV
CVE-2022-38181Shared CWE-416both on KEV
CVE-2016-9079Shared CWE-416both on KEV
CVE-2024-1086Shared CWE-416both on KEV
CVE-2019-8605Shared CWE-416both on KEV

Affected Assets

php
php
7.3.0 — 8.2.35 · 8.3.0 — 8.3.36 · 8.4.0 — 8.4.27
siemens
ruggedcom ape1808 firmware
all versions
paloaltonetworks
pan-os
10.2.10, 10.2.11, 10.2.12, 10.2.13, 10.2.14 · 10.2.0 — 10.2.7 · 11.1.0 — 11.1.4 · 11.2.0 — 11.2.4
paloaltonetworks
panorama virtual appliance
all versions
siemens
blueplanet 360 nx3 m6 wm od iisx firmware
all versions
siemens
blueplanet 360 nx3 m6 wm od iisx-s firmware
all versions
siemens
energy engage
2.0, 3.1
siemens
spectrum power 4
all versions
siemens
spectrum power 7
all versions
siemens
spectrum power tg
all versions
+1 more product configuration(s) — see NVD for full list

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 3 hardening rules · 3 OS baselines
Validate
Prove the fix (OWASP ASVS)
  • V1.4.3

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation partial match

Developer testing and evaluation can discover use-after-free bugs through dynamic analysis or fuzzing.

SA-15 Development Process, Standards, and Tools partial match

Requiring documented development processes and tools enables use of analyzers or coding standards that identify uninitialized pointer defects.

SA-8 Security and Privacy Engineering Principles partial match

Engineering principles can require memory-safe constructs or languages that structurally avoid introducing use-after-free.

SC-6 Resource Availability partial match

SC-6 directly enforces resource quotas and priority allocations that stop unbounded sequential memory requests from exhausting the system.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
blocks

Secure SDLC practices directly incorporate memory-safety tooling and reviews that prevent most use-after-free defects.

ID.RA-01 partial match
blocks

Vulnerability identification processes can discover use-after-free issues via scanning or analysis but do not prevent their introduction.

PR.PS-02 partial match
blocks

Routine patching removes known use-after-free instances after they have been introduced in released software.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development can detect use-after-free bugs before release.

A.8.16 Monitoring activities partial match
finds

Monitoring can surface unhandled exceptions but does not enforce proper handling.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly prescribe avoidance of use-after-free patterns.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over our cross-walk; rows rated `none` are excluded, and each rule says how its mapping was checked.

Definition changed on 29 October 2026. Until then this section listed every rule rated above none, partial included. From that date it lists rules whose mapping is rated full or mostly and checked at llm_unverified or higher; partial mappings show when you ask.

Oracle Linux 8 (1 partial rule)
  • V-248592 OL 8 must clear memory when it is freed to prevent use-after-free attacks. blocks CWE-416 llm_unverified
RHEL 8 (1 partial rule)
  • V-230279 RHEL 8 must clear memory when it is freed to prevent use-after-free attacks. blocks CWE-416 llm_unverified
RHEL 9 (1 rule)
  • V-257794 RHEL 9 must clear memory when it is freed to prevent use-after-free attacks. blocks CWE-416 llm_unverified

References