Vulnerability · Published Mar 27, 2026 · Assigned by GitHub_M
CVE-2026-33654Zero-Click Indirect Prompt Injection and Authentication Bypass via Email Polling
High 8.9
In plain English
A high-severity code injection in nanobot from HKUDS. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).
Official 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 (as reported)
Weakness: CWE-94, CWE-290, CWE-1336 · Vector: 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
References
- https://github.com/HKUDS/nanobot/security/advisories/GHSA-4gmr-2vc8-7qh3 x_refsource_CONFIRM