CVE-2026-73863— NanoMQ: Heap-Buffer-Overflow in `nmq_subinfo_decode()` During MQTT v5 SUBSCRIBE Parsing
Quick assessment
Affected
nanomq nanomq
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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 c
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I. Basic Information for CVE-2026-73863
Vulnerability Information
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Vulnerability Title
NanoMQ: Heap-Buffer-Overflow in `nmq_subinfo_decode()` During MQTT v5 SUBSCRIBE Parsing
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-73863
| # | POC Description | Source Link | Shenlong Link |
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Patches & Fixes for CVE-2026-73863 (2)
Vendor Pages for CVE-2026-73863 (1)
Other References for CVE-2026-73863 (1)
Same Patch Batch · nanomq · 2026-09-18 · 3 CVEs total
| CVE-2026-44639 | 3.7 LOW | NanoMQ: O(N²) Denial of Service in MQTT v5 Property Parsing |
| CVE-2026-61633 | 2.0 LOW | NanoMQ: Infinite Loop in UNSUBSCRIBE Decoder Leading to Remote DoS |
IV. Related Vulnerabilities
Same product: nanomq
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CVE-2026-61633
NanoMQ: Infinite Loop in UNSUBSCRIBE Decoder Leading to Remo -
CVE-2026-44639
NanoMQ: O(N²) Denial of Service in MQTT v5 Property Parsing -
CVE-2026-47276
NULL Pointer Dereference in REST API properties_parse via Ma -
CVE-2026-47275
nanomq NULL Pointer Dereference in MQTTv5 Client CONNECT Dec -
CVE-2026-35217
NanoMQ Incorrectly Accepts a Malformed SUBSCRIBE and Can Be
Same vendor: nanomq
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CVE-2026-61633
NanoMQ: Infinite Loop in UNSUBSCRIBE Decoder Leading to Remo -
CVE-2026-44639
NanoMQ: O(N²) Denial of Service in MQTT v5 Property Parsing -
CVE-2026-47276
NULL Pointer Dereference in REST API properties_parse via Ma -
CVE-2026-47275
nanomq NULL Pointer Dereference in MQTTv5 Client CONNECT Dec -
CVE-2026-35217
NanoMQ Incorrectly Accepts a Malformed SUBSCRIBE and Can Be
Same weakness: CWE-125
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libheif: Incomplete fix for CVE-2026-62292 leaves libheif vu -
CVE-2026-84448
libheif: Heap out-of-bounds read in libheif inline-mask regi
V. Comments for CVE-2026-73863
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