Vulnerability · Published Apr 20, 2026 · Assigned by GitHub_M

CVE-2026-32135NanoMQ has Heap Buffer Overflow in URI Parameter Parsing

High 7.7

In plain English

A high-severity heap buffer overflow in nanomq from nanomq. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).

Severity (CVSS 4.0)7.7High

Exploit odds (30 days)0.5%top 56.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Versions prior to 0.24.11 have a remotely triggerable heap buffer overflow in the `uri_param_parse` function of NanoMQ's REST API. The vulnerability occurs due to an off-by-one error when allocating memory for query parameter keys and values, allowing an attacker to write a null byte beyond the allocated buffer. This can be triggered via a crafted HTTP request. Version 0.24.11 patches the issue.

Affected products (as reported)

Vendor	Product	Versions
nanomq	nanomq	< 0.24.11

Weakness: CWE-122 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

References

https://github.com/nanomq/nanomq/security/advisories/GHSA-6w96-9qw7-m599 x_refsource_CONFIRM
https://github.com/nanomq/nanomq/issues/2247 x_refsource_MISC
https://github.com/nanomq/nanomq/commit/69a97b3b39cc218f044f1c8896f4d3d8757bb394 x_refsource_MISC