CVE-2026-13491

78 xiaozhi-esp32 MQTT Goodbye mqtt_protocol.cc GetInstance denial of service

CVSS 6.3 MEDIUMEPSS 0.4%CWE-404

Vexday Risk Score

33Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

CVSS 6.3EPSS 0.4%KEV nãoPoC públicaNuclei —Metasploit —Patch referenciado

Lifecycle

28 Jun 2026Published on NVD

Recommendation: Plan a near-term fix — a public PoC already exists.

A vulnerability was detected in 78 xiaozhi-esp32 up to 2.2.6. This vulnerability affects the function Application::GetInstance of the file main/protocols/mqtt_protocol.cc of the component MQTT Goodbye Handler. Performing a manipulation of the argument session_id results in denial of service. The attack is possible to be carried out remotely. The complexity of an attack is rather high. It is stated that the exploitability is difficult. The exploit is now public and may be used. The patch is named e182471f8c5a22434346bd98da34d3b66c8c8b3e. It is recommended to apply a patch to fix this issue.

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

Affected products

78 · xiaozhi-esp32

public PoCs found — 1

cve_referencegithub.com/78/xiaozhi-esp32/issues/2022unverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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References

https://github.com/78/xiaozhi-esp32/https://github.com/78/xiaozhi-esp32/commit/e182471f8c5a22434346bd98da34d3b66c8c8b3e https://github.com/78/xiaozhi-esp32/issues/2022 https://github.com/78/xiaozhi-esp32/pull/2023 https://vuldb.com/cve/CVE-2026-13491 https://vuldb.com/submit/838439 https://vuldb.com/vuln/374488 https://vuldb.com/vuln/374488/cti