How severe is CVE-2026-33654?

CVE-2026-33654 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33654 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33654?

CVE-2026-33654 primarily affects Nanobot. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-33654?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-33654 have an EU (EUVD) identifier?

Yes. CVE-2026-33654 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16777.

When was CVE-2026-33654 published?

CVE-2026-33654 was published on 2026-03-27 and last updated on 2026-06-17.

CVE-2026-33654

CVE-2026-33654 is a critical-severity vulnerability in Nanobot with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 8.9
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16777
Weakness: CWE-94
Affected product: Nanobot
Published: 2026-03-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-33654?: 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.
How severe is CVE-2026-33654?: CVE-2026-33654 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-33654 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33654?: CVE-2026-33654 primarily affects Nanobot. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-33654?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-33654 have an EU (EUVD) identifier?: Yes. CVE-2026-33654 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16777.
When was CVE-2026-33654 published?: CVE-2026-33654 was published on 2026-03-27 and last updated on 2026-06-17.

References

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

Affected products (7)

cpe:2.3:a:nanobot:nanobot:*:*:*:*:*:python:*:*
cpe:2.3:a:nanobot:nanobot:0.1.4:-:*:*:*:python:*:*
cpe:2.3:a:nanobot:nanobot:0.1.4:post1:*:*:*:python:*:*
cpe:2.3:a:nanobot:nanobot:0.1.4:post2:*:*:*:python:*:*
cpe:2.3:a:nanobot:nanobot:0.1.4:post3:*:*:*:python:*:*
cpe:2.3:a:nanobot:nanobot:0.1.4:post4:*:*:*:python:*:*
cpe:2.3:a:nanobot:nanobot:0.1.4:post5:*:*:*:python:*:*

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