# ASCII smuggling prompt injection

Published articles for ASCII smuggling prompt injection.

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## What is ASCII smuggling, and how is it helping spammers bypass AI email filters?

DevFeed: [What is ASCII smuggling, and how is it helping spammers bypass AI email filters?](<https://devfeed.tech/articles/what-is-ascii-smuggling-and-how-is-it-helping-spammers-bypass-ai-email-filters-56595.md>)

Original publisher: [Read original article](<https://indianexpress.com/article/technology/tech-news-technology/what-is-ascii-smuggling-spam-ai-email-filters-10865353/>)

Author: Tech Desk

Published: 2026-09-06T05:48:04Z

Content type: article

Language: en

Sources: [Technology | The Indian Express](<https://devfeed.tech/sources/technology-the-indian-express.md>)

Topics: [ASCII](<https://devfeed.tech/topics/ascii.md>), [Cybersecurity](<https://devfeed.tech/topics/cybersecurity.md>), [prompt injection](<https://devfeed.tech/topics/prompt-injection.md>), [Artificial Intelligence](<https://devfeed.tech/topics/ai.md>), [email](<https://devfeed.tech/topics/email.md>), [Malware](<https://devfeed.tech/topics/malware.md>)

Tags: [ai-spam-filter-bypass](<https://devfeed.tech/tags/ai-spam-filter-bypass.md>), [ascii](<https://devfeed.tech/tags/ascii.md>), [ascii-smuggling](<https://devfeed.tech/tags/ascii-smuggling.md>), [ascii-smuggling-prompt-injection](<https://devfeed.tech/tags/ascii-smuggling-prompt-injection.md>), [cybersecurity](<https://devfeed.tech/tags/cybersecurity.md>), [email](<https://devfeed.tech/tags/email.md>), [invisible-unicode-text-ai-evasion](<https://devfeed.tech/tags/invisible-unicode-text-ai-evasion.md>), [microsoft-cybersecurity-report-september-2026](<https://devfeed.tech/tags/microsoft-cybersecurity-report-september-2026.md>), [microsoft-defender](<https://devfeed.tech/tags/microsoft-defender.md>), [microsoft-defender-for-office-spam-spike](<https://devfeed.tech/tags/microsoft-defender-for-office-spam-spike.md>), [phishing](<https://devfeed.tech/tags/phishing.md>), [prompt-injection](<https://devfeed.tech/tags/prompt-injection.md>), [tech](<https://devfeed.tech/tags/tech.md>), [technology](<https://devfeed.tech/tags/technology.md>), [technology-tech](<https://devfeed.tech/tags/technology-tech.md>), [unicode-tag-characters-phishing](<https://devfeed.tech/tags/unicode-tag-characters-phishing.md>)

### AI overview

The article explains how ASCII smuggling uses invisible Unicode tag characters to evade AI-powered email spam filters. It describes Microsoft's observation of a high-volume phishing campaign and connects the technique to earlier prompt injection attacks against AI agents.

### Source excerpt

In 2026, there has been a surge in the number of spam messages delivered to email inboxes with the help of ASCII smuggling, according to Microsoft.