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

Quick assessment

Affected
HKUDS nanobot
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

nanobot是Data Intelligence Lab@HKU开源的一个轻量个人AI助手。 nanobot 0.1.6之前版本存在安全漏洞，该漏洞源于电子邮件通道处理模块存在间接提示注入，可能导致远程未经验证的攻击者执行任意LLM指令。

AI Predicted 9.8 Difficulty: Trivial EPSS 0.51% · P43

Possible ATT&CK Techniques 1 AI

T1566.001 · Spearphishing Attachment
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I. Basic Information for CVE-2026-33654

Vulnerability Information
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Vulnerability Title
Zero-Click Indirect Prompt Injection and Authentication Bypass via Email Polling
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
nanobot 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nanobot是Data Intelligence Lab@HKU开源的一个轻量个人AI助手。 nanobot 0.1.6之前版本存在安全漏洞，该漏洞源于电子邮件通道处理模块存在间接提示注入，可能导致远程未经验证的攻击者执行任意LLM指令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
HKUDS nanobot < 0.1.4.post6 -

II. Public POCs for CVE-2026-33654

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III. Intelligence Information for CVE-2026-33654

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Vendor Advisories for CVE-2026-33654 (1)

IV. Related Vulnerabilities

Same product: nanobot
Same vendor: HKUDS
Same weakness: CWE-94