Check Point Finds DNS Tunneling Data Leak
Check Point Software Technologies on April 4, 2026 disclosed a DNS-tunneling vulnerability in ChatGPT’s code-execution runtime that can exfiltrate user data without triggering outbound alerts. The company demonstrated how malicious prompts or compromised custom GPTs could hide data in DNS lookups, quietly leaking model summaries and uploaded files, posing privacy and enterprise-security risks for millions of users.
Key Points
- 1Identifies DNS tunneling vulnerability in ChatGPT runtime enabling covert data exfiltration via DNS lookups
- 2Shows attack bypasses GPT Actions and outbound blocks, undermining expected user-visible transfer controls
- 3Warns practitioners to vet custom GPTs and prompts, restrict file handling and monitor DNS resolution activity
Scoring Rationale
Fresh disclosure (April 4, 2026) from reputable Check Point describing a novel, practical DNS-exfiltration path in ChatGPT. Scored high for novelty, scope, and credibility; slightly reduced because published mitigations and deep technical guidance are limited.
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