PALO ALTO Security Advisory
Published Date: Not specified
CVE: CVE-2026-0297
Advisory Summary
💡 📌 Title — CVE-2026-0297: GlobalProtect App UDP Tunnel Handshake Buffer Overflow (Severity: MEDIUM)
🛡️ 🔎 What happened
Palo Alto Networks disclosed CVE-2026-0297, a buffer overflow in the GlobalProtect app that can occur during the UDP tunnel handshake process. This affects how the client establishes a UDP-based tunnel, creating a risk surface where malformed/hostile network conditions could trigger unsafe memory handling.
- Potential memory corruption conditions that could lead to crash or potentially more severe outcomes depending on exploitability and mitigations.
- Exposed pathway is tied to UDP tunnel handshake traffic, which can be reached through network interaction patterns (not necessarily requiring privileged access).
- Given its MEDIUM severity, it may be a “patch-now” issue for environments with exposed VPN access or high threat exposure.
- Higher risk for organizations using GlobalProtect in internet-facing or partially untrusted network contexts (e.g., remote workforce).
- Incident likelihood increases if attackers can influence or observe handshake traffic patterns.
- Even if full remote code execution is not confirmed/guaranteed, reliability impacts (DoS/crashes) should be assumed in defensive planning.
- High-exposure user groups
- Systems reachable by untrusted networks
- Restrict inbound reachability where possible
- Monitor for anomalous UDP handshake behavior
- Unusual spikes in GlobalProtect UDP handshake attempts
- Repeated tunnel negotiation failures or client instability correlated to specific network sources/regions
- Any correlated crashes/restarts of GlobalProtect processes after traffic bursts
📌 🧾 Reference
-2026-0297
Reference: Vendor Advisory