{"type":"post","id":"understanding-and-mitigating-role-spoofing-in-llms-8df394","slug":"understanding-and-mitigating-role-spoofing-in-llms-8df394","title":"Understanding and Mitigating Role Spoofing in LLMs","description":"A paper submitted to arXiv on October 29, 2026 studies role spoofing: malicious text in a tool output can make a language model attribute that text to the user.","retrieval_nugget":"A paper submitted to arXiv on October 29, 2026 studies role spoofing: malicious text in a tool output can make a language model attribute that text to the user. The authors analyze the cues behind this failure and propose activation-based probes as a detector, giving agent builders a specific failure mode to test for—without establishing a production-ready defense.","published_at":"2026-11-01","updated_at":"2026-11-01","record_date":"2026-11-01","date_kind":"published_at","topics":["agent-security","ai-security"],"entities":["Ezra Edelman","Benjamin Edelman","Surbhi Goel","Eran Malach","arXiv"],"related_patterns":["agent-security-moves-to-runtime-boundaries"],"novelty_label":"new_fact","what_changed":"This UPenn paper adds evidence that combined fake structure and content enable role spoofing, finds adversarial training leaves structure-based attacks, and proposes linear-probe detection.","prior_refs":[],"source_url":"https://arxiv.org/abs/2610.40396","source_urls":["https://arxiv.org/abs/2610.40396"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:understanding-and-mitigating-role-spoofing-in-llms-8df394","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/understanding-and-mitigating-role-spoofing-in-llms-8df394/","markdown":"https://newruntime.com/posts/understanding-and-mitigating-role-spoofing-in-llms-8df394.md","json":"https://newruntime.com/posts/understanding-and-mitigating-role-spoofing-in-llms-8df394.json"},"markdown_url":"https://newruntime.com/posts/understanding-and-mitigating-role-spoofing-in-llms-8df394.md","next_reads":[{"type":"topic","path":"/topics/agent-security/","url":"https://newruntime.com/topics/agent-security/","title":"Agent Security","reason":"Explore the agent-security topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/agent-security.md","json_url":"https://newruntime.com/topics/agent-security.json"},{"type":"topic","path":"/topics/ai-security/","url":"https://newruntime.com/topics/ai-security/","title":"Ai Security","reason":"Explore the ai-security topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/ai-security.md","json_url":"https://newruntime.com/topics/ai-security.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/sources/","url":"https://newruntime.com/sources/","title":"Sources","reason":"See the original sources this archive cites.","media_type":"text/html"}]}