CVE-2026-13491

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.62% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 49.6% of scored records. A rank, not a probability.

NVD base score

2.9 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-10-25.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-06-28 11:15Z4 MO AGO

Last updated

2026-06-29 12:29Z4 MO AGO

Reserved

2026-06-27

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 6.3)

CNA CVSS vector

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

Weaknesses

• CWE-404Improper Resource Shutdown or ReleaseClass

Data version

5.2

Document digest

8de8c181d8ebeebdf18d937b4a2c4e731a136619ba5b6ef42bee663d620ef76c

• vuldb.comVDB-374488 | 78 xiaozhi-esp32 MQTT Goodbye mqtt_protocol.cc GetInstance denial of servicehttps://vuldb.com/vuln/374488vdb-entrytechnical-description
• vuldb.comVDB-374488 | CTI Indicators (IOB, IOC, TTP, IOA)https://vuldb.com/vuln/374488/ctisignaturepermissions-required
• vuldb.comCVE-2026-13491 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-13491third-party-advisory
• vuldb.comSubmit #838439 | 78 xiaozhi-esp32 2aeecd4e014780ac15cfa4866906cca16267010d Denial of Servicehttps://vuldb.com/submit/838439third-party-advisory
• github.comhttps://github.com/78/xiaozhi-esp32/issues/2022exploitissue-tracking
• github.comhttps://github.com/78/xiaozhi-esp32/pull/2023issue-trackingpatch
• github.comhttps://github.com/78/xiaozhi-esp32/commit/e182471f8c5a22434346bd98da34d3b66c8c8b3epatch
• github.comhttps://github.com/78/xiaozhi-esp32/product