Out-of-bounds Read Affecting emqx/nanomq package, versions [,0.24.7)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published12 Mar 2026
- disclosed11 Mar 2026
- creditUnknown
Introduced: 11 Mar 2026
CVE-2026-21888 (opens in a new tab)How to fix?
Upgrade emqx/nanomq to version 0.24.7 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Read in the conn_handler() function. An attacker can cause a crash or trigger an out-of-bounds read by sending a crafted MQTT v5 message containing a 5-byte variable byte integer, which is not properly bounds-checked during parsing.