CVE-2026-109618: PHP Memory Corruption Vulnerability

78

Urgent

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

CISA KEV · Oct 26, 2026 Detection templates (Nuclei) · 1 Exploit-DB · 1 Proofs of concept on GitHub · 73

How the score was calculated

Confirmed exploitation (CISA KEV)+35
Public exploit/PoC (nuclei, exploitdb, github)+18
EPSS 100% (30-day exploitation probability)+15
Technical severity (critical)+10

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Confirmed

CISA KEV, listed Oct 26, 2026

EPSS FIRST

99.98%

ahead of 100% of scored CVEs · Oct 26, 2026

Affects

Palo Alto Networks

PAN-OS and 2 more

CVSS base

9.8

Critical · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Active

none · proof-of-concept · active

Automatable

No

can an attacker script the kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented mitigation — github.com (NIST National Vulnerability Database)

CISA required action CISA

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.

US federal deadline: Oct 29, 2026 — due in 2 day(s)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Palo Alto Networks PAN-OS, Palo Alto Networks Panorama Virtual Appliance, Php PHP…).
Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
Apply the documented mitigations until a definitive fix is available.
EPSS ahead of 100% of scored CVEs: prioritize it in the patch queue.
Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Palo Alto Networks	PAN-OS	version 12.1.7-h1version 12.1.4version 12.1.4-h10version 12.1.4-h11version 12.1.4-h12version 12.1.4-h2version 12.1.4-h3version 12.1.4-h5 and 283 more version 12.1.4-h6version 12.1.4-h7version 12.1.4-h8version 12.1.4-h9version 12.1.5version 12.1.6version 12.1.7version 11.2.7-h2version 12.1.7-h2version 12.1.7-h3version 12.1.7-h5version 12.1.7-h6version 12.1.7-h8version 12.1.7-h9version 12.1.8version 12.1.9version 12.1.10version 12.1.10-h2≥ 12.2.0 and < 12.2.4version 12.2.4versions not specified by the sourceversion 11.2.16version 11.2.7-h19version 11.2.7-h3version 11.2.7-h4version 11.2.7-h7version 11.2.7-h8version 11.2.8version 11.2.9version 11.2.10version 11.2.10-h1version 11.2.10-h10version 11.2.10-h12version 11.2.10-h13version 11.2.10-h2version 11.2.10-h3version 11.2.10-h5≥ 12.1.0 and < 12.1.4version 11.2.15version 11.2.13-h3version 11.2.13-h2version 11.2.13-h1version 11.2.13version 11.2.11version 11.2.10-h9version 11.2.10-h8version 11.2.10-h7version 11.2.10-h6version 11.2.10-h4version 11.2.12≥ 10.2.0 and < 10.2.7version 10.2.7version 10.2.7-h1version 10.2.7-h10version 10.2.7-h11version 10.2.7-h12version 10.2.7-h13version 10.2.7-h14version 10.2.7-h15version 10.2.7-h16version 10.2.7-h17version 10.2.7-h18version 10.2.7-h19version 10.2.7-h2version 10.2.7-h20version 10.2.7-h21version 10.2.7-h22version 10.2.7-h23version 10.2.7-h24version 10.2.7-h3version 10.2.7-h32version 10.2.7-h34version 10.2.7-h35version 10.2.7-h36version 10.2.7-h37version 10.2.7-h38version 10.2.7-h4version 10.2.7-h5version 10.2.7-h6version 10.2.7-h7version 10.2.7-h8version 10.2.7-h9version 10.2.8version 10.2.9version 10.2.10version 10.2.10-h1version 10.2.10-h10version 10.2.10-h11version 10.2.10-h12version 10.2.10-h13version 10.2.10-h14version 10.2.10-h17version 10.2.10-h18version 10.2.10-h2version 10.2.10-h21version 10.2.10-h27version 10.2.10-h3version 10.2.10-h30version 10.2.10-h31version 10.2.10-h36version 10.2.10-h37version 10.2.10-h39version 10.2.10-h4version 10.2.10-h40version 10.2.10-h41version 10.2.10-h5version 10.2.10-h6version 10.2.10-h7version 10.2.10-h8version 10.2.10-h9version 10.2.11version 10.2.12version 10.2.13version 10.2.13-h1version 10.2.13-h10version 10.2.13-h15version 10.2.13-h16version 10.2.13-h18version 10.2.13-h2version 10.2.13-h21version 10.2.13-h22version 10.2.13-h23version 10.2.13-h24version 10.2.13-h26version 10.2.13-h3version 10.2.13-h4version 10.2.13-h5version 10.2.13-h7version 10.2.14version 10.2.15version 10.2.16version 10.2.16-h1version 10.2.16-h10version 10.2.16-h11version 10.2.16-h4version 10.2.16-h6version 10.2.16-h7version 10.2.16-h8version 10.2.16-h9version 10.2.17version 10.2.18version 10.2.18-h1version 10.2.18-h10version 10.2.18-h12version 10.2.18-h5version 10.2.18-h6version 10.2.18-h7version 10.2.18-h8version 10.2.18-h9≥ 11.1.0 and < 11.1.4version 11.1.4version 11.1.4-h1version 11.1.4-h10version 11.1.4-h11version 11.1.4-h12version 11.1.4-h13version 11.1.4-h15version 11.1.4-h16version 11.1.4-h17version 11.1.4-h18version 11.1.4-h2version 11.1.4-h25version 11.1.4-h27version 11.1.4-h3version 11.1.4-h32version 11.1.4-h33version 11.1.4-h34version 11.1.4-h35version 11.1.4-h36version 11.1.4-h37version 11.1.4-h4version 11.1.4-h5version 11.1.4-h6version 11.1.4-h7version 11.1.4-h8version 11.1.4-h9version 11.1.5version 11.1.6version 11.1.6-h1version 11.1.6-h10version 11.1.6-h14version 11.1.6-h17version 11.1.6-h18version 11.1.6-h19version 11.1.6-h2version 11.1.6-h20version 11.1.6-h21version 11.1.6-h22version 11.1.6-h23version 11.1.6-h25version 11.1.6-h29version 11.1.6-h3version 11.1.6-h32version 11.1.6-h33version 11.1.6-h34version 11.1.6-h35version 11.1.6-h36version 11.1.6-h38version 11.1.6-h39version 11.1.6-h4version 11.1.6-h5version 11.1.6-h6version 11.1.6-h7version 11.1.7version 11.1.7-h1version 11.1.7-h10version 11.1.7-h11version 11.1.7-h2version 11.1.7-h4version 11.1.7-h6version 11.1.7-h8version 11.1.8version 11.1.9version 11.1.10version 11.1.10-h1version 11.1.10-h10version 11.1.10-h12version 11.1.10-h21version 11.1.10-h25version 11.1.10-h26version 11.1.10-h27version 11.1.10-h28version 11.1.10-h30version 11.1.10-h32version 11.1.10-h33version 11.1.10-h35version 11.1.10-h4version 11.1.10-h5version 11.1.10-h7version 11.1.10-h9version 11.1.11version 11.1.12version 11.1.13version 11.1.13-h1version 11.1.13-h10version 11.1.13-h11version 11.1.13-h12version 11.1.13-h15version 11.1.13-h2version 11.1.13-h3version 11.1.13-h5version 11.1.13-h6version 11.1.13-h7version 11.1.13-h8version 11.1.13-h9version 11.1.14version 11.1.15version 11.1.16version 11.1.16-h1version 11.1.16-h2version 11.1.16-h3≥ 11.2.0 and < 11.2.4version 11.2.4version 11.2.4-h1version 11.2.4-h10version 11.2.4-h11version 11.2.4-h12version 11.2.4-h14version 11.2.4-h15version 11.2.4-h17version 11.2.4-h18version 11.2.4-h2version 11.2.4-h20version 11.2.4-h3version 11.2.4-h4version 11.2.4-h5version 11.2.4-h6version 11.2.4-h7version 11.2.4-h8version 11.2.4-h9version 11.2.5version 11.2.6version 11.2.7version 11.2.7-h1version 11.2.7-h10version 11.2.7-h11version 11.2.7-h12version 11.2.7-h13version 11.2.7-h14version 11.2.7-h15version 11.2.7-h16version 11.2.7-h17version 11.2.7-h18	Vulnerable	NIST National Vulnerability Database
Palo Alto Networks	Panorama Virtual Appliance	versions not specified by the source	Vulnerable	NIST National Vulnerability Database
Php	PHP	≥ 8.3.0 and < 8.3.36≥ 8.4.0 and < 8.4.27≥ 8.5.0 and < 8.5.12≥ 7.3.0 and < 8.2.35	Vulnerable	NIST National Vulnerability Database
PHP Group	PHP	≥ 8.2.* and < 8.2.35≥ 8.3.* and < 8.3.36≥ 8.4.* and < 8.4.27≥ 8.5.* and < 8.5.12	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
9.2	CVSS 4.0	Critical	—	—	security@php.net via NIST National Vulnerability Database
9.2	CVSS 4.0	Critical	—	—	php via CVE Program (cve.org) e CISA ADP
9.8	CVSS 3.1	Critical	3.9	5.9	nvd@nist.gov via NIST National Vulnerability Database

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-416 · Use After Free

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

Listed

Oct 26, 2026

Federal deadline

Oct 29, 2026

due in 2 day(s)

Ransomware use

Unknown

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

Public exploits, PoCs and detection templates

Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.

Detection templates (Nuclei)

PHP2Shell (CVE-2026-109618/CVE-2026-109619) - Vulnerable Version Detection

Exploit-DB

PHP2Shell (CVE-2026-109618) - PHP core versions after v5.4 - RCE Oct 22, 2026

Proofs of concept on GitHub — 73 repositories; showing the 10 most starred

CVE-2026-109618/109619 PHP session.upload_progress Exploit Research — POC & Analysis ★ 360 Oct 21, 2026
Proof-of-Concept (PoC) exploit for php2shell (CVE-2026-109618 / CVE-2026-109619), demonstrating remote code execution in vulnerable PHP environments. For security research and educational purposes only. ★ 136 Oct 21, 2026
PoC CVE-2026-109618 / -109619 (PHP session.upload_progress heap UAF) ★ 44 Oct 21, 2026
Emergency Apache mitigation and testing toolkit for the zero day php2shell (CVE-2026-109618 / CVE-2026-109619), blocking multipart POST requests before they reach PHP. ★ 38 Oct 21, 2026
Stopgap for php2shell (CVE-2026-109618 / CVE-2026-109619): tiny PHP extension that detaches the session upload-progress handler at startup. PHP 5.6-8.5, Debian/Sury, cPanel, DirectAdmin. ★ 23 Oct 21, 2026
Offline, reproducible lab to safely analyse an untrusted PoC for CVE-2026-109618/109619 and build detection rules. No exploit included; bring your own sample. ★ 13 Oct 21, 2026
19h/CVE-2026-109618 ★ 7 Oct 21, 2026
PHP2Shell (CVE-2026-109618 / CVE-2026-109619) Docker lab and PoC. Use-After-Free in PHP's session.upload_progress. ★ 7 Oct 21, 2026
richardmongler/php2shell-CVE-2026-109618 ★ 6 Oct 21, 2026
junaire/CVE-2026-109618-exploit ★ 6 Oct 21, 2026

Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.

EPSS over time FIRST

Oct 22, 2026 → Oct 26, 2026 · 5 reading(s) · max 99.98%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
Hunt retroactively in logs from before Oct 26, 2026 (KEV listing): exploitation may have started earlier.

web/proxy/WAF logsnetwork IDS/IPSendpoint telemetry (EDR)crash dumps

Timeline

What happened to this CVE, newest first.

2026
Source status changed · Undergoing Analysis → Analyzed
Oct 27, 2026 · NIST National Vulnerability Database
SSVC assessment updated
Oct 27, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · Analyzed → Undergoing Analysis
Oct 27, 2026 · NIST National Vulnerability Database
Added to CISA KEV (detected)
Oct 26, 2026 · CISA Known Exploited Vulnerabilities
Added to CISA KEV catalog
Oct 25, 2026 · CISA
Affected products removed · 1
Oct 23, 2026 · NIST National Vulnerability Database
Affected products added · php/php, siemens/ruggedcom ape1808 firmware, paloaltonetworks/pan-os, paloaltonetworks/panorama virtual appliance
Oct 23, 2026 · NIST National Vulnerability Database
Source status changed · Undergoing Analysis → Analyzed
Oct 23, 2026 · NIST National Vulnerability Database
Source status changed · Modified → Undergoing Analysis
Oct 23, 2026 · NIST National Vulnerability Database
Source status changed · Analyzed → Modified
Oct 23, 2026 · NIST National Vulnerability Database
Source status changed · Modified → Analyzed
Oct 22, 2026 · NIST National Vulnerability Database
Source status changed · Analyzed → Modified
Oct 21, 2026 · NIST National Vulnerability Database
Fix documented
Oct 21, 2026 · NIST National Vulnerability Database
Affected products added · php/php
Oct 21, 2026 · NIST National Vulnerability Database
CVSS changed · 9.2 → 9.8
Oct 21, 2026 · NIST National Vulnerability Database
Source status changed · Undergoing Analysis → Analyzed
Oct 21, 2026 · NIST National Vulnerability Database
Source status changed · Received → Undergoing Analysis
Oct 21, 2026 · NIST National Vulnerability Database
SSVC assessment updated
Oct 21, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · Published → Received
Oct 21, 2026 · NIST National Vulnerability Database
Record published
Oct 21, 2026
CVSS changed · 9.2
Oct 21, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Published
Oct 21, 2026 · CVE Program (cve.org) e CISA ADP
Record created in this database
Oct 21, 2026 · CVE Program (cve.org) e CISA ADP
CVE published
Oct 21, 2026 · php

Source activity

Repeated readings are counted rather than listed.

5× References added · Oct 21, 2026 – Oct 27, 2026
1× Official description updated · Oct 21, 2026 – Oct 21, 2026

References

8 on the record

github.com/php/php-src/security/advisories/GHSA-w8hw-w9fx-j79w
vendor-advisory, Mitigation, Vendor Advisory, CVE Program (cve.org) e CISA ADP
www.cisa.gov/known-exploited-vulnerabilities-catalog
US Government Resource, NIST National Vulnerability Database
www.openwall.com/lists/oss-security/2026/10/23/5
Mailing List, Third Party Advisory, NIST National Vulnerability Database
www.openwall.com/lists/oss-security/2026/10/21/6
Mailing List, Third Party Advisory, NIST National Vulnerability Database
www.wiz.io/blog/php2shell-php-rce
Third Party Advisory, NIST National Vulnerability Database
cert-portal.siemens.com/productcert/html/ssa-566512.html
Third Party Advisory, NIST National Vulnerability Database
php2shell.delftintellab.com
Third Party Advisory, NIST National Vulnerability Database
arcticwolf.com/resources/blog/php2shell-critical-php-vulnerabilities-enable-unauthen
Third Party Advisory, NIST National Vulnerability Database

Elsewhere on this site

Palo Alto Networks
every CVE for this vendor

2026-10
what else CISA listed that month

Memory corruption
same class

CWE-416
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-109619 PHP Stale Internal Request-State Vulnerability KEV 6d
Medium CVE-2026-0320 PAN-OS: Authenticated Admin Command Injection Vulnerability 12d
Medium CVE-2026-0319 PAN-OS: Improper Input Handling Vulnerability 12d
Medium CVE-2026-0318 PAN-OS: Denial of Service (DoS) on Panorama 12d
Low CVE-2026-0317 PAN-OS: Denial of Service Vulnerability 12d
Low CVE-2026-0316 PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability 12d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-109618 is "PHP Memory Corruption Vulnerability", rated Critical. It affects PAN-OS (Palo Alto Networks); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 9.8 describes technical severity. EPSS 99.98% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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