Invisible Unicode characters in AI prompts pose a real security risk, experts warn

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Debate over whether Anthropic's Claude Code inserts hidden Unicode characters into prompts has drawn attention to a broader, more serious issue in AI pipelines. Certain Unicode codepoints — including zero-width spaces, variation selectors, and tag-block characters — are invisible in most editors and terminals yet survive copy-paste and still carry data. Because these characters are indistinguishable from clean text to most tools, they can be used to smuggle prompt-injection instructions past keyword filters and content guardrails. Any external text ingested by an AI system — scraped webpages, uploaded PDFs, RAG-indexed content — could potentially carry such hidden payloads. Security researchers urge developers to treat incoming text as raw codepoint sequences rather than assuming what is visually readable is all that is present.

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