Heap overflow and SSO misconfiguration expose OpenAI internal repositories
openai
| Source: HN | Original article
A heap overflow combined with an SSO misconfiguration allowed attackers to compromise OpenAI’s internal repositories.
Hacktron AI, a security‑research firm, disclosed on 18 September 2026 a two‑stage attack that let its team reach OpenAI’s internal monorepo. The researchers first exploited a heap‑buffer overflow in the libheif image‑decoder library, which is used to process HEIC files. The flaw, present in an unpatched Debian package, gave them out‑of‑bounds read/write primitives during image decoding. They then leveraged a misconfiguration in OpenAI’s Single Sign‑On (SSO) setup, allowing the compromised employee credentials to be used for privileged access to the company’s internal repositories.
The chain demonstrates how a seemingly innocuous component—an image‑processing library—can be combined with weak identity‑management settings to breach a high‑profile AI organization’s core code base. Access to the monorepo could expose proprietary model code, training pipelines, and other intellectual property, raising concerns about supply‑chain security and the potential for malicious model tampering. The incident also underscores the growing role of AI‑accelerated exploitation, as Hacktron noted that the attack leveraged Claude Opus 5 to automate parts of the exploitation workflow.
As we reported on 18 September 2026, OpenAI was already the target of a breach that used Anthropic’s Claude to gain footholds in its systems. This new disclosure adds another layer to the mounting pressure on the company to harden its development environment. Watch for OpenAI’s forthcoming security patches to libheif and a review of its SSO configuration, as well as any regulatory or industry‑wide responses that may tighten standards for AI‑driven threat detection and supply‑chain resilience.
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