ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-21888

NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform.

Published Mar 11, 2026 · catalog updated Jun 17, 2026 · NanoMQ MQTT Broker (NanoMQ)

Check if you run it

No confirmed exploitation is on record for CVE-2026-21888. EPSS is 0.31%. Act only if a listed version of NanoMQ MQTT Broker (NanoMQ) is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (NanoMQ MQTT Broker (NanoMQ)).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.31%
Remediation
Version ranges on file
Affected products
cpe emqx/nanomq · stated nanomq

NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer() accepts 5-byte varints without bounds checks; reliably triggers OOB read / crash when built with ASan. This affects 0.24.6 and earlier.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe emqx/nanomqversion unspecified
  • stated nanomq<= 0.24.6

How to fix CVE-2026-21888

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-21888. EPSS is 0.31%. Act only if a listed version of NanoMQ MQTT Broker (NanoMQ) is installed.

Which versions are affected?

Compare what you have installed with <= 0.24.6. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-125: Out-of-bounds Read. EPSS 0.31%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 11, 2026 · NIST NVD

    Detected

    NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer() accepts 5-byte varints without bounds checks; reliably triggers OOB read / crash when built with ASan. This affects 0.24.6 and earlier.

  2. Jun 17, 2026 · NIST NVD

    Updated

    NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer() accepts 5-byte varints without bounds checks; reliably triggers OOB read / crash when built with ASan. This affects 0.24.6 and earlier.

Sources

  • CVE.orgVulnerability recordCVE-2026-21888

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-21888

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-21888

    NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer() accepts 5-byte varints without bounds checks; reliably triggers OOB read / crash when built with ASan. This affects 0.24.6 and earlier.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.