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CVE

CVE-2026-21888

MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer()
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CVE

CVE-2026-21888

MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer()

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

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21888.json, https://github.com/nanomq/nanomq/security/advisories/GHSA-cggc-6m7w-j7x5, https://nvd.nist.gov/vuln/detail/CVE-2026-21888, https://github.com/nanomq/nanomq/issues/2192

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.00097%
EPSS Percentile
0.26486%
Introduced Version
0
Fix Available

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