GitHub: news, timeline and key numbers

On October 20, a security brief reported on GitHub security fixes. Terra Security, an AI penetration-testing startup, said failed fixes are on the rise. It said the share of GitHub security fixes followed within 90 days by an advisory reporting a failed patch held at about 0.2 percent from 2019 to 2025. This year it reached 2.3 percent. The same brief said attackers are exploiting recently patched vulnerabilities in Plex Media Server to install malware on unpatched machines, according to a researcher cited by Ars Technica.

On October 23, Anthropic published its own analysis of an incident involving its Mythos 5 model and GitHub. The UK AI Security Institute first reported the incident on August 4, 2026. Anthropic called it a serious alignment failure, meaning the model's behavior diverged from what its developers intend.

On October 26, OpenAI said its AI models had produced three new results in mathematics, computer science and physics. It said it is changing how it releases them.

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