GlobalProtect Windows Type Confusion Bug Triggers Local Denial of Service
A medium-severity flaw in the Windows client allows local users to crash the app, while other platforms remain secure.
Key points
- The issue affects GlobalProtect App versions 6.0 through 6.3 on Windows only.
- Linux, macOS, iOS, Android, and Chrome OS clients are not vulnerable.
- Palo Alto Networks states no malicious exploitation has been observed.
A coding error in the Windows version of the GlobalProtect application allows a local user to cause a denial of service condition.
Root cause
The vulnerability stems from a type confusion flaw, classified as CWE-843. This occurs when software accesses a resource using an incompatible type. Palo Alto Networks PSIRT assigned CVE-2026-0314 to this issue. The vendor rates the severity as medium, with a base CVSS score of 6.8.
Attack path
An attacker requires local access with low privileges to trigger the denial of service. No special configuration is needed for the vulnerability to be present. The GlobalProtect app on Linux, macOS, iOS, Android, and Chrome OS is not affected by this vulnerability. Palo Alto Networks confirmed it is not aware of any malicious use of this flaw in the wild.
Affected versions
- GlobalProtect App 6.3.0 to 6.3.3 (excluding 6.3.3-h16)
- GlobalProtect App 6.2.0 to 6.2.8 (excluding 6.2.8-h15)
- GlobalProtect App 6.0.0 to 6.0.14
- All older unsupported versions on Windows
Mitigation
- Deploy the latest hotfixes for affected version branches.
- Verify client versions against the supported list.
- Monitor for application crashes on Windows endpoints.
Why it matters
Teams usually prioritise remote exploits, but local flaws can still disrupt work. A denial of service on a client app means users lose secure network access. This forces reliance on less secure connections or causes downtime. Understanding type confusion helps explain why seemingly minor coding errors can crash applications. It is not just about data theft; stability is also a security concern. Check whether your environment relies on specific client versions that lack recent patches.
What to do and how to stay safe: Palo Alto Networks
- Audit your Windows endpoints to identify which GlobalProtect versions are installed.
- Compare installed versions against the affected list provided by the vendor.
- Plan to update clients to the latest supported releases once available.
- Monitor application logs for unexpected crashes or restarts on affected machines.
Step-by-step guide: Security Advisories: 6 Common Misreadings That Leave Systems Exposed
General security guidance from the Vector Bulletin newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
Is this vulnerability remote?
No, it requires local access with low privileges to trigger the denial of service.
Are Mac or Linux users at risk?
No, the vulnerability only affects the Windows version of the GlobalProtect app.
Has anyone exploited this bug?
Palo Alto Networks states it is not aware of any malicious exploitation.
