Observed Signal · Sep 19, 2026 · Security Breach · Source: Trending Topics (DACH/CEE Innovation & Tech) · Impact: 4/5 · Sentiment: Negative
AI Security Market: Hacktron Uses Claude Opus 5 to Breach OpenAI Repositories
The article details how Hacktron AI, a security startup, allegedly exploited a heap buffer overflow in libheif to breach OpenAI's internal code repositories using Anthropic's Claude Opus 5. The attack, which targeted unreleased model code and documentation, began with a malicious image upload on the Discourse forum, then leveraged an SSO misconfiguration to access ChatGPT and Codex accounts. OpenAI patched the issues within 14 hours and paid a $6,500 bounty. Hacktron documented the breach, noting the attack cost under $3,000 in tokens and was part of a larger 'HEIF Heist' investigation affecting other companies. The incident highlights the growing threat of AI-powered cyberattacks and the need for robust security in AI development environments, with other labs reporting similar incidents.
High-profile AI security breach involving a major AI platform, highlighting vulnerabilities in AI infrastructure and the potential misuse of AI models for cyberattacks, which could have far-reaching implications for the AdTech industry's reliance on AI technologies.
Key Takeaways & Evidence Grounding
- Hacktron AI used Anthropic's Claude Opus 5 to develop an exploit for a heap buffer overflow in libheif, triggered via image upload, to access OpenAI internal repositories.
- The attack targeted unreleased model code and documentation, starting from a Discourse forum and using an SSO misconfiguration to gain wider access.
- OpenAI patched the vulnerabilities within 14 hours and paid a $6,500 bounty.
- The campaign was part of a larger 'HEIF Heist' investigation affecting other companies like Slack, Meta, and GitHub Enterprise.
- The breach underscores the growing offensive capabilities of AI agents, with other labs reporting similar incidents.
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