CVE-2026-21888— MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer()
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I. Basic Information for CVE-2026-21888
Vulnerability Information
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Vulnerability Title
MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer()
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
Source: NVD (National Vulnerability Database)
Vulnerability Title
NanoMQ 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NanoMQ是美国EMQ开源的一款用于物联网边缘平台的轻量级快速 MQTT Broker。 NanoMQ 0.24.6及之前版本存在缓冲区错误漏洞，该漏洞源于MQTT v5可变字节整数解析时缺少边界检查，可能导致越界读取或崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-21888
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IV. Related Vulnerabilities
Same product: nanomq
- CVE-2026-32135
NanoMQ has Heap Buffer Overflow in URI Parameter Parsing - CVE-2026-34608
nanomq: Heap-Buffer-Overflow in webhook_inproc.c via cJSON_P - CVE-2026-32696
NanoMQ HTTP Auth: Missing username/password can trigger a NU - CVE-2026-25627
nanomq: OOB Read / Crash (DoS) via Malformed MQTT Remaining - CVE-2026-22040
NanoMQ 0.24.6 Use-After-Free Leading to Heap Corruption and
Same vendor: nanomq
- CVE-2026-32135
NanoMQ has Heap Buffer Overflow in URI Parameter Parsing - CVE-2026-34608
nanomq: Heap-Buffer-Overflow in webhook_inproc.c via cJSON_P - CVE-2026-32696
NanoMQ HTTP Auth: Missing username/password can trigger a NU - CVE-2026-25627
nanomq: OOB Read / Crash (DoS) via Malformed MQTT Remaining - CVE-2026-22040
NanoMQ 0.24.6 Use-After-Free Leading to Heap Corruption and
Same weakness: CWE-125
- CVE-2026-8177
XML::LibXML versions through 2.0210 for Perl read out-of-bou - CVE-2026-6104
Global buffer over-read in mb_convert_encoding() with attack - CVE-2026-7258
Out-of-bounds read in urldecode() on NetBSD - CVE-2026-8186
Open5GS NF client.c ogs_sbi_client_send_via_scp_or_sepp out- - CVE-2026-3508
ASUS System Control Interface 缓冲区错误漏洞
V. Comments for CVE-2026-21888
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