What’s Vulnerable › Vulnerabilities

CVE-2026-33654: Zero-Click Indirect Prompt Injection and Authentication Bypass via Email Polling

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-27 · updated 2026-10-26
• Weakness: CWE-94

Description

nanobot is a personal AI assistant. Prior to version 0.1.6, an indirect prompt injection vulnerability exists in the email channel processing module (`nanobot/channels/email.py`), allowing a remote, unauthenticated attacker to execute arbitrary LLM instructions (and subsequently, system tools) without any interaction from the bot owner. By sending an email containing malicious prompts to the bot's monitored email address, the bot automatically polls, ingests, and processes the email content as highly trusted input, fully bypassing channel isolation and resulting in a stealthy, zero-click attack. Version 0.1.6 patches the issue.

Affected products

• HKUDS nanobot: before 0.1.4; 0.1.4, 0.1.4-post1, 0.1.4-post2, 0.1.4-post3, 0.1.4-post4, 0.1.4-post5 — fixed in 0.1.4

How to fix

Upgrade to a fixed version: HKUDS nanobot 0.1.4. Check the vendor advisory for mitigations.

References

• https://github.com/HKUDS/nanobot/security/advisories/GHSA-4gmr-2vc8-7qh3
• https://github.com/HKUDS/nanobot/security/advisories/GHSA-4gmr-2vc8-7qh3

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