CVE-2026-0250 Overview
CVE-2026-0250 is a buffer overflow vulnerability in the Palo Alto Networks GlobalProtect™ app. The flaw allows a man-in-the-middle (MITM) attacker positioned on an adjacent network to disrupt system processes and potentially execute arbitrary code with SYSTEM privileges. The vulnerability is triggered when the GlobalProtect client processes requests and responses exchanged between the Portal and Gateway components. The GlobalProtect app on iOS is not affected. The weakness is classified under [CWE-787] (Out-of-Bounds Write).
Critical Impact
A successful exploit grants SYSTEM-level code execution on the endpoint, giving an attacker full control over the affected workstation through manipulation of Portal-Gateway traffic.
Affected Products
- Palo Alto Networks GlobalProtect™ app (Windows, macOS, Linux, Android)
- GlobalProtect client during Portal and Gateway communication
- GlobalProtect app on iOS is not affected
Discovery Timeline
- 2026-05-13 - CVE-2026-0250 published to NVD
- 2026-05-13 - Last updated in NVD database
Technical Details for CVE-2026-0250
Vulnerability Analysis
The vulnerability is an out-of-bounds write [CWE-787] in the GlobalProtect app's handling of protocol traffic exchanged with the GlobalProtect Portal and Gateway. When the client parses crafted responses from what it believes is a legitimate Portal or Gateway, a buffer overflow occurs in memory regions used to stage the response data. The corruption can be steered to overwrite control structures and divert execution flow into attacker-supplied content. Because the GlobalProtect service runs with elevated privileges on Windows, successful exploitation results in arbitrary code execution under the SYSTEM account.
Root Cause
The root cause is improper validation of length or size fields in messages received during GlobalProtect Portal and Gateway communication. The client copies attacker-influenced data into a fixed-size buffer without enforcing the destination boundary, producing a classic memory corruption condition consistent with [CWE-787].
Attack Vector
Exploitation requires an adjacent-network position that allows the attacker to intercept and modify GlobalProtect traffic between the endpoint and the Portal or Gateway. A MITM attacker injects malformed protocol responses that trigger the overflow during parsing. No user interaction is required. Successful exploitation yields code execution with SYSTEM privileges, enabling persistence, credential theft, and lateral movement.
No verified public proof-of-concept code is available. Refer to the Palo Alto Networks CVE-2026-0250 Advisory for vendor-supplied technical details.
Detection Methods for CVE-2026-0250
Indicators of Compromise
- Unexpected crashes or restarts of the GlobalProtect service (PanGPS.exe, PanGPA.exe) on endpoints
- TLS certificate anomalies or unexpected certificate chains presented to GlobalProtect clients during Portal or Gateway connections
- New child processes spawned by the GlobalProtect service running under SYSTEM, particularly command interpreters or script hosts
Detection Strategies
- Monitor endpoint telemetry for abnormal behavior originating from GlobalProtect processes, including unexpected memory access patterns and process spawn chains
- Inspect network logs for GlobalProtect sessions that terminate with TLS handshake anomalies, downgrade attempts, or unexpected proxy interception
- Correlate GlobalProtect client crash events with concurrent network anomalies on the same VLAN or wireless segment
Monitoring Recommendations
- Alert on certificate pinning failures and TLS validation errors reported by GlobalProtect clients
- Track GlobalProtect version inventory across the fleet to surface endpoints still running vulnerable builds
- Forward endpoint and network telemetry to a centralized analytics platform to detect adjacent-network MITM staging activity
How to Mitigate CVE-2026-0250
Immediate Actions Required
- Apply the GlobalProtect app updates published in the Palo Alto Networks CVE-2026-0250 Advisory to all Windows, macOS, Linux, and Android endpoints
- Inventory the GlobalProtect client version deployed across the organization and prioritize remote-worker and high-privilege endpoints
- Enforce strict certificate validation and disable any configurations that allow users to bypass certificate warnings
Patch Information
Palo Alto Networks has published advisory guidance and fixed versions for the GlobalProtect app at the Palo Alto Networks CVE-2026-0250 Advisory. Administrators should consult the advisory for the specific fixed releases applicable to each supported operating system and roll out updated clients through standard endpoint management channels.
Workarounds
- Restrict GlobalProtect client use on untrusted networks where adjacent-network MITM positioning is feasible, such as public Wi-Fi, until patched
- Enforce FIPS-CC mode and certificate pinning where supported to harden Portal and Gateway authentication against MITM tampering
- Segment endpoint networks to limit an attacker's ability to gain adjacent-network access to GlobalProtect clients
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
