CVE-2026-0314

Executive Summary

CVE-2026-0314 is a type confusion vulnerability (CWE-843) in the Palo Alto Networks GlobalProtect app for Windows that allows a local, low-privileged user to trigger a denial-of-service condition. Only the Windows GlobalProtect client is affected; the Linux, macOS, iOS, Android, and Chrome OS clients are explicitly stated as not affected. The vulnerability requires local access and low privileges, meaning impact is scoped to the endpoint rather than the network perimeter, but it can disrupt VPN connectivity for the affected host.

Technical Analysis

The vulnerability class is a type confusion, tracked as CWE-843. Type confusion occurs when software allocates or handles a resource as one type (e.g., an object, structure, or memory region) but subsequently accesses it as a different, incompatible type. When the program later dereferences the mis-typed object, the mismatch can result in memory corruption, invalid reads/writes, or an unhandled exception that terminates the affected process.

In this CVE, the affected component is the Palo Alto Networks GlobalProtect app on Windows. Per the vendor's own description, exploitation requires only that a local attacker hold low privileges on the host — no administrative rights and no user interaction are described as necessary. The result is a denial-of-service condition, which in the context of a VPN client typically means the GlobalProtect process crashes or becomes unresponsive, terminating the user's tunnel and disrupting connectivity to protected corporate resources.

The exact code path that is subject to the type confusion is not specified in the available advisory text. The NVD description does not name any function, module, class, DLL, service, or IPC interface, and it does not describe the trigger input, the specific object types involved, or whether the confusion occurs during tunnel establishment, policy enforcement, update processing, or inter-process communication. Accordingly, no code-level detail regarding the confused types or the dereferencing site can be stated with confidence. Any analysis below operates at the level of the vulnerability class and the stated privilege/impact boundary rather than at the level of specific implementation artifacts.

Two aspects of the vulnerability's scoping are notable and are stated explicitly by the vendor:

• Platform scoping: only the Windows GlobalProtect app is affected. The Linux, macOS, iOS, Android, and Chrome OS clients are not affected. This suggests the flaw is tied to a Windows-specific code path, build, or interface rather than to the shared cross-platform core of the client.
• Privilege scoping: a "local user with low privileges" is sufficient to trigger the DoS. This places the vulnerability in the classic local privilege-boundary/robustness category, where an unprivileged process on the same host can influence a higher-privileged or differently-sandboxed component. Whether the confused object crosses a security boundary (for example, an unprivileged caller supplying data later consumed by a privileged GlobalProtect service) is not stated in the available data, so that architectural detail should not be assumed.

The CVSS v3.1 vector is assessed as CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, reflecting a local attack vector, low attack complexity, low privileges required, no user interaction, unchanged scope, and impact limited to availability (High). Note that no authoritative CVSS score or vector was published in the source data for this CVE; the vector above is a class-consistent derivation and should be treated as provisional rather than vendor-confirmed.

Exploitation Scenarios

The following attack chain is described strictly at the vulnerability-class level. No public proof-of-concept, exploit code, or Nuclei template exists for CVE-2026-0314, and the advisory text does not disclose the specific input, interface, or code path involved. The chain is therefore inferred from the vulnerability class (type confusion) and the stated preconditions (local, low-privileged, Windows GlobalProtect app).

1. Reconnaissance / target identification An attacker who already holds a foothold on a Windows endpoint (for example, via a separate initial-access vector, a malicious insider, or a compromised low-privileged account) identifies that the Palo Alto Networks GlobalProtect app is installed and running. Presence can be confirmed through standard host enumeration of running processes, installed applications, and network adapters. No remote or unauthenticated reconnaissance is applicable, because the vulnerability requires local code execution on the host.

2. Triggering the flaw class The attacker, operating with low privileges, causes the GlobalProtect app to process a resource that it treats as one type but that was constructed or supplied as another. Where such confused-type input is delivered is not disclosed in the advisory; the trigger could plausibly be a local interaction with the client (for example, through a locally reachable interface or file the client consumes), but no specific endpoint, file path, registry key, named pipe, or parameter is named in the available description and none should be assumed. The essential mechanism is the type mismatch itself: the component operates on the object under the wrong type assumption, producing undefined behavior in the client process.

3. Execution effect The undefined behavior manifests as a crash or hang of the GlobalProtect process — the denial-of-service condition described by the vendor. Because only low privileges are required and no user interaction is needed, the attacker does not need to elevate or persuade a user to act; the trigger is self-contained from the attacker's low-privileged context.

4. Post-exploitation impact The impact is availability-only and host-scoped. The most direct effect is loss of the VPN tunnel on the victim host, which disrupts access to internal corporate resources and, depending on configuration, may also interrupt security telemetry, policy enforcement, or always-on VPN connectivity for that endpoint. The advisory describes no confidentiality or integrity impact, so the attack as documented should not be characterized as enabling data theft, code execution, or lateral movement. Repeated triggering could sustain the DoS against the affected host, but the scope remains local.

In summary: no public PoC is available; this attack chain is inferred from the type confusion vulnerability class and the vendor-stated local, low-privilege precondition. Specific implementation details are not available in the source data and are intentionally omitted rather than invented.

Impact Assessment

CVE-2026-0314 is a local denial-of-service vulnerability affecting only the Palo Alto Networks GlobalProtect app on Windows. The availability impact is rated High under a provisional CVSS v3.1 vector of CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; the NVD data record did not publish an authoritative score. Confidentiality and integrity impacts are none, and scope is unchanged.

Business impact is concentrated on endpoints protected by GlobalProtect rather than on the VPN gateway or the wider network. An attacker with low privileges on a single Windows host can render that host's VPN client unusable, denying the user access to internal applications and potentially cutting off the endpoint's tunnel-based security controls. Blast radius per successful trigger is one host; the vulnerability does not chain into the gateway, does not grant code execution, and does not, on the basis of the published description, enable lateral movement or data exfiltration. The EPSS score is 0.00099 (0.8th percentile of exploited CVEs), indicating a very low probability of exploitation activity in the wild at the time of this assessment, and the CVE is not listed in CISA's KEV catalog. The practical risk is therefore highest for environments with untrusted or shared local users — for example, VDI, contractor, or BYOD scenarios where a low-privileged local actor shares the endpoint with a GlobalProtect-protected session.

Detection Guidance

Sigma Rule

title: Potential GlobalProtect Client Denial of Service via Type Confusion (CVE-2026-0314)
id: 8f2c1a44-0314-4cve-9a7b-0b0c0314a001
status: experimental
description: Detects abnormal termination or crash of the Palo Alto Networks GlobalProtect client process on Windows, which may indicate attempted exploitation of CVE-2026-0314 (local low-privileged denial of service via type confusion).
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-0314
author: Threat Intelligence
date: 2026/01/01
tags:
  - attack.t1499
  - cve.2026.0314
logsource:
  product: windows
  category: process_creation
detection:
  selection_parent:
    Image|endswith:
      - '\GlobalProtect.exe'
      - '\PanGPA.exe'
      - '\PanGPS.exe'
  selection_crash_indicators:
    - EventID: 1000
    - EventID: 1001
  condition: selection_parent or selection_crash_indicators
falsepositives:
  - Legitimate GlobalProtect upgrades or administrator-initiated restarts
  - Normal application crashes unrelated to exploitation
level: medium

YARA Rule

rule CVE_2026_0314_GlobalProtect_DoSSigma
{
    meta:
        description = "Heuristic detection for artifacts referencing GlobalProtect client DoS exploitation on Windows (CVE-2026-0314). Type confusion DoS produces no unique binary artifact; this rule is heuristic and targets crash-dump strings."
        author = "Threat Intelligence"
        date = "2026-01-01"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-0314"
        cve = "CVE-2026-0314"

    strings:
        $gp1 = "GlobalProtect" ascii wide nocase
        $gp2 = "PanGPA" ascii wide nocase
        $gp3 = "PanGPS" ascii wide nocase
        $gp4 = "PanGP" ascii wide nocase
        $crash1 = "type confusion" ascii wide nocase
        $crash2 = "ACCESS_VIOLATION" ascii wide

    condition:
        uint16(0) == 0x5A4D and
        (2 of ($gp*)) and
        any of ($crash*)
}

Suricata IDS Rule

alert tcp $HOME_NET any -> $HOME_NET any (msg:"CVE-2026-0314 Palo Alto GlobalProtect Client DoS Activity Indicator (local, no network signature)"; flow:to_server,established; content:"GlobalProtect"; nocase; threshold: type both, track by_src, count 20, seconds 10; classtype:attempted-dos; sid:2026031401; rev:1; metadata:cve CVE-2026-0314, mitre_tactic T1499;)

Note: CVE-2026-0314 is a local vulnerability with no network-facing trigger described in the advisory. The above rule is a placeholder for correlating GlobalProtect tunnel activity preceding a host-scoped DoS and should not be treated as a reliable exploit signature.

Elastic Detection

process where host.os.type == "windows" and
  process.parent.name in ("GlobalProtect.exe", "PanGPA.exe", "PanGPS.exe") and
  event.action == "start" and
  process.name in ("WerFault.exe", "wermgr.exe")

This query detects Windows Error Reporting being spawned by a GlobalProtect component, which is consistent with the client crashing as a result of a successful local denial-of-service condition.

Splunk SPL Query

index=windows (source="XmlWinEventLog:Application" OR source="WinEventLog:Application")
(EventCode=1000 OR EventCode=1001)
| search (FaultingModule LIKE "%PanGP%" OR FaultingModule LIKE "%GlobalProtect%" OR Message LIKE "%GlobalProtect%" OR Message LIKE "%PanGP%")
| stats count min(_time) as first_seen max(_time) as last_seen by host, FaultingModule, Message
| where count >= 1
| convert ctime(first_seen) ctime(last_seen)
| table host, first_seen, last_seen, FaultingModule, count, Message

Wazuh OSSEC Rule

<group name="windows,globalprotect,cve-2026-0314,">
  <rule id="20260314" level="8">
    <if_sid>60000</if_sid>
    <field name="win.system.eventID">^1000$|^1001$</field>
    <field name="win.eventdata.faultingModuleName">GlobalProtect|PanGPA|PanGPS|PanGP</field>
    <description>CVE-2026-0314: Possible Palo Alto GlobalProtect client crash/denial-of-service on $(win.system.computer)</description>
    <mitre>
      <id>T1499</id>
    </mitre>
    <group>dos,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence is 0/4: no patch, vendor advisory, or fix version has been published by any tracked source, and no workarounds are documented. The following measures are mitigations rather than fixes; they reduce exposure while awaiting an official fix.

1. Immediate mitigations

• Enforce least privilege on Windows endpoints and remove unnecessary local interactive or shared-user access, since the vulnerability requires only low local privileges to trigger. This is the primary compensating control.
• Where operationally feasible, restrict which users can log on locally to hosts running the GlobalProtect app, reducing the population of potential low-privileged local attackers.
• Monitor the GlobalProtect client processes for unexpected termination (see Detection Guidance) and investigate repeated crashes on a host as a potential exploitation signal.
• Ensure endpoint detection and response (EDR) coverage is healthy on Windows clients, and enable logging of application crash events (Windows Error Reporting, Event IDs 1000/1001) for central visibility.

2. Patch/upgrade steps

• No fixed version is available. Track Palo Alto Networks security advisories and the NVD entry for CVE-2026-0314 and apply the vendor-provided fix as soon as it is released.
• When a fix is published, prioritize Windows endpoints running the GlobalProtect app and validate the client version after upgrade.

3. Long-term hardening

• Maintain a software inventory of VPN client versions across the Windows fleet to enable fast, targeted remediation once a patch exists.
• Apply defense-in-depth for VPN endpoints: network segmentation, least-privilege workstation models, and monitoring of tunnel-drop anomalies that could indicate availability attacks.
• Incorporate the CVE and the T1499 tactic into threat-hunting hypotheses, and review whether the low-privileged local threat model (shared endpoints, VDI, contractor devices) applies to your environment and warrants architectural change.

References

• NVD — CVE-2026-0314: https://nvd.nist.gov/vuln/detail/CVE-2026-0314
• Palo Alto Networks Security Advisories (vendor advisory portal; no specific advisory for CVE-2026-0314 confirmed at time of writing): https://security.paloaltonetworks.com/
• MITRE ATT&CK — T1499 Endpoint Denial of Service: https://attack.mitre.org/techniques/T1499/
• CWE-843 Type Confusion: https://cwe.mitre.org/data/definitions/843.html
• FIRST EPSS — CVE-2026-0314 scoring: https://api.first.org/data/v1/epss?cve=CVE-2026-0314

No threat actor campaigns, exploit-in-the-wild evidence, or CISA KEV listing are associated with CVE-2026-0314 at the time of this assessment. No public proof-of-concept or exploit code has been observed.