Denial of Service in xiaozhi-esp32 MQTT Goodbye Handler
CVE-2026-13491 is a denial-of-service vulnerability affecting xiaozhi-esp32 through version 2.2.6. The issue is in the MQTT Goodbye Handler, specifically involving the function Application::GetInstance in main/protocols/mqtt_protocol.cc. According to the provided content, manipulation of the session_id argument can trigger the flaw. The vulnerability is remotely exploitable, though attack complexity is described as high and exploitability as difficult. A public exploit is reported to exist.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Recent activity
8 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.