CVE-2026-33654Public exploitNetwork attack vector

Remote tool execution via spoofed email sender

Published Mar 27, 2026 · Updated Mar 27, 2026

Indirect prompt injection in nanobot before 0.1.4.post6 allows remote attackers to execute agent tools through a spoofed email. The email channel's _fetch_messages method trusts the forgeable RFC 5322 From header as sender_id, passes the body to AgentLoop, and authorizes it against allow_from without SPF, DKIM, or DMARC verification. Exploitation requires the email channel and a forged allowlisted sender; enabled ExecTool access permits system command execution without owner interaction.

CVSS severity9.8
Critical
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Indirect prompt injection in nanobot before 0.1.4.post6 allows remote attackers to execute agent tools through a spoofed email. The email channel's _fetch_messages method trusts the forgeable RFC 5322 From header as sender_id, passes the body to AgentLoop, and authorizes it against allow_from without SPF, DKIM, or DMARC verification. Exploitation requires the email channel and a forged allowlisted sender; enabled ExecTool access permits system command execution without owner interaction.

The record

CVE
CVE-2026-33654
Published
Mar 27, 2026
Updated
Mar 27, 2026
Vendor
Data Intelligence Lab @ HKU
Product
nanobot
Classifications
CWE-1336, CWE-94, CWE-290
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.1.4.post6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Data Intelligence Lab @ HKU · nanobotversion=< 0.1.4.post6

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.9GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1336Improper Neutralization of Special Elements Used in a Template Engine
CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-290Authentication Bypass by Spoofing

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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