CVE-2026-47275

2.6 LOW 0.3% exploit odds Fix listed Memory safety

What it is

In nanomq versions 0.24.11 and earlier, a NULL pointer dereference in `nni_mqttv5_msg_decode_connect()` allows a malicious MQTT broker to crash any connecting NanoMQ MQTTv5 client (including bridge mode) with a single packet, causing remote denial of service via SIGSEGV. In `nni_mqttv5_msg_decode_connect()` (`mqtt_codec.c:1863`), the code iterates over CONNECT properties using variable `prop` when it should use `will_prop`. When a CONNECT packet has no connect-level properties (`prop == NULL`) but has will properties (`will_prop != NULL`), dereferencing `prop->next` causes SIGSEGV at address `0x38` (NULL + `offsetof(property, next)`). This affects both `nanomq_cli` and **NanoMQ bridge mode** (Core component), as both use the same `mqtt_client.c` receive path. This can lead to remote DoS if a malicious MQTT broker can crash the client process with a single 35-byte packet and persistent DoS if auto-reconnect causes infinite crash loop.

At a glance

Exploitability: Can be exploited over the network with a low-privilege account, but needs a user to act. Limited direct impact.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-07-20 17:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-07-23 16:04 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.3% in the next 30 days (EPSS).
Severity: 2.6 LOW (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2026-07-20 17:17 UTC
Last modified: 2026-07-23 16:04 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-476 · NULL pointer dereference
Record status: Deferred

Attack profile CVSS 3.1 · 2.6

Attack vector: Network
Complexity: High
Privileges needed: Low
User interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: Low

Raw vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L

Is it in your code?

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Read https://cve-list.com/agent/cve/CVE-2026-47275.md and follow it. Check whether this project is affected by CVE-2026-47275. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record