CVE-2026-32135Public exploitNetwork attack vector

Service crash via off-by-one query parsing

Published Apr 20, 2026 · Updated Apr 20, 2026

Heap buffer overflow in EMQ Technologies NanoMQ before 0.24.11 allows remote attackers to crash the broker via a crafted HTTP request. In nanomq/rest_api.c, uri_param_parse allocates key and value buffers at strlen bytes, then sscanf appends terminators past those allocations. The REST API must be enabled and reachable; it requires Basic or JWT authentication, and the documented default Basic credentials are admin/public.

CVSS severity7.5
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in EMQ Technologies NanoMQ before 0.24.11 allows remote attackers to crash the broker via a crafted HTTP request. In nanomq/rest_api.c, uri_param_parse allocates key and value buffers at strlen bytes, then sscanf appends terminators past those allocations. The REST API must be enabled and reachable; it requires Basic or JWT authentication, and the documented default Basic credentials are admin/public.

The record

CVE
CVE-2026-32135
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
EMQ Technologies
Product
NanoMQ
Classifications
CWE-122
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.24.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EMQ Technologies · NanoMQversion=< 0.24.11

Published CVSS scores

7.7GitHub, Inc.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
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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