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CVE-2025-10543

Quick assessment

Affected
Eclipse Foundation paho.mqtt.golang (Go MQTT v3.1 library)
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.

Eclipse Paho Go MQTT v3.1 library是Eclipse基金会的一个Go语言软件库。 Eclipse Paho Go MQTT v3.1 library 1.5.0及之前版本存在安全漏洞，该漏洞源于未检查数据长度转换时的溢出，可能导致数据包内容泄露。

AI Predicted 7.5 Difficulty: Easy EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-10543

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In Eclipse Paho Go MQTT v3.1 library (paho.mqtt.golang) versions <=1.5.0 UTF-8 encoded strings, passed into the library, may be incorrectly encoded if their length exceeds 65535 bytes. This may lead to unexpected content in packets sent to the server (for example, part of an MQTT topic may leak into the message body in a PUBLISH packet). The issue arises because the length of the data passed in was converted from an int64/int32 (depending upon CPU) to an int16 without checks for overflows. The int16 length was then written, followed by the data (e.g. topic). This meant that when the data (e.g. topic) was over 65535 bytes then the amount of data written exceeds what the length field indicates. This could lead to a corrupt packet, or mean that the excess data leaks into another field (e.g. topic leaks into message body).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
数值类型间的不正确转换
Source: CVE Program / CVE List V5
Vulnerability Title
Eclipse Paho Go MQTT v3.1 library 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Eclipse Paho Go MQTT v3.1 library是Eclipse基金会的一个Go语言软件库。 Eclipse Paho Go MQTT v3.1 library 1.5.0及之前版本存在安全漏洞，该漏洞源于未检查数据长度转换时的溢出，可能导致数据包内容泄露。
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

Vendor Product Affected Versions CPE Subscribe
Eclipse Foundation paho.mqtt.golang (Go MQTT v3.1 library) 0 ~ 1.5.0 -

II. Public POCs for CVE-2025-10543

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III. Intelligence Information for CVE-2025-10543

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Other References for CVE-2025-10543 (1)

IV. Related Vulnerabilities

Same vendor: Eclipse Foundation
Same weakness: CWE-681

V. Comments for CVE-2025-10543

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