CVE-2026-73863
Severity not reportedNanoMQ is an MQTT broker.
NanoMQ is an MQTT broker. Prior to 0.24.14, NanoMQ's broker-side MQTT v5 nmq_subinfo_decode() function in nng/src/sp/protocol/mqtt/mqtt_parser.c reuses len_of_varint from the outer Properties Length while parsing each SUBSCRIPTION_IDENTIFIER. A remote client can send a SUBSCRIBE packet with a multi-byte Properties Length and repeated subscription identifiers, causing get_var_integer() to begin at an incorrect offset and read beyond the heap message buffer. The flaw is reachable through the broker receive path and can crash the broker, while the separately reported topic-option off-by-one occurs later and is not this vulnerability. This issue is fixed in version 0.24.14.
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/nanomq/NanoNNG/commit/f888fe39d6691b253ff9aee598ce58bbe449ab6f security-advisories@github.com
- https://github.com/nanomq/NanoNNG/pull/1518 security-advisories@github.com
- https://github.com/nanomq/nanomq/releases/tag/0.24.14 security-advisories@github.com
- https://github.com/nanomq/nanomq/security/advisories/GHSA-pf97-vm7h-q84m security-advisories@github.com
- https://github.com/nanomq/nanomq/security/advisories/GHSA-pf97-vm7h-q84m 134c704f-9b21-4f2e-91b3-4a467353bcc0