What’s Vulnerable › Vulnerabilities

CVE-2026-47276: NULL Pointer Dereference in REST API properties_parse via Malformed user_properties

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-20 · updated 2026-07-23
• Weakness: CWE-476

Description

In nanomq versions 0.24.11 and earlier, a NULL pointer dereference in `properties_parse()` allows an authenticated attacker to crash the NanoMQ broker by sending a POST request to `/api/v4/mqtt/publish` with `user_properties` as a JSON array instead of a JSON object. The crash occurs because `strlen()` is called on a NULL `item->string` pointer when iterating over array elements. An authenticated attacker can exploit this to crash the NanoMQ broker process. This is patched in version 0.24.14.

Affected products

• nanomq: through 0.24.11

References

• https://github.com/nanomq/nanomq/security/advisories/GHSA-qq2v-xvxg-3hvf
• https://github.com/nanomq/nanomq/security/advisories/GHSA-qq2v-xvxg-3hvf

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