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CVE-2026-32696
3.1 LOW
- CVSS version: 3.1
- Attack vector (AV): NETWORK
- Attack complexity (AC): HIGH
- Privileges required (PR): NONE
- User interaction (UI): REQUIRED
- Scope (S): UNCHANGED
- Confidentiality impact (C): NONE
- Integrity impact (I): NONE
- Availability impact (A): LOW
NanoMQ HTTP Auth: Missing username/password can trigger a NULL-pointer strlen() in auth_http.c:set_data(), causing a process crash — SIGSEGV, remotely triggerable
NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In NanoMQ version 0.24.6, after enabling auth.http_auth (HTTP authentication), when a client connects to the broker using MQTT CONNECT without providing username/password, and the configuration params uses the placeholders %u / %P (e.g., username="%u", password="%P"), the HTTP request construction phase enters auth_http.c:set_data(). This results in calling strlen() on a NULL pointer, causing a SIGSEGV crash. This crash can be triggered remotely, resulting in a denial of service. This issue has been patched in version 0.24.7.
References
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https://github.com/nanomq/nanomq/security/advisories/GHSA-77f4-wvq8-mp3p x_refsource_CONFIRM
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https://github.com/nanomq/NanoNNG/pull/1394 x_refsource_MISC
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https://github.com/nanomq/nanomq/releases/tag/0.24.7 x_refsource_MISC
Affected products
nanomq
- ==>= 0.24.6, < 0.24.7
Package maintainers
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@sikmir Nikolay Korotkiy <sikmir@disroot.org>