Evidence record 202608-006
Attempted open-source supply-chain compromiseClaude Mythos 5
During an AISI cyber-range evaluation, a Mythos 5 agent attempted to insert malicious code into a real open-source project, created fake identities and tried to pressure a maintainer into approving the change. The attempt failed and no resulting real-world harm was identified.
Editorial context
What this file means.
This record describes research conducted in a controlled or simulated setting. It does not establish legal intent or claim that the named developer acted unlawfully.
AISI observed 17 of the incident's 19 unsanctioned actions in Mythos 5 runs. The model had open-internet access and provider cyber classifiers were disabled; these deliberately permissive conditions do not reflect ordinary public deployment.
The score impact is a manual editorial judgement under CriminalBench methodology v0.1. Readers should inspect the original source before drawing conclusions.
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