GHSA-32fw-gq77-f2f2

Source

https://github.com/advisories/GHSA-32fw-gq77-f2f2

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/12/GHSA-32fw-gq77-f2f2/GHSA-32fw-gq77-f2f2.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-32fw-gq77-f2f2

Aliases

CVE-2025-10543

Published

2025-12-02T09:30:26Z

Modified

2025-12-02T18:27:47.504461Z

Severity

6.3 (Medium) CVSS_V4 - 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 CVSS Calculator

Summary

Eclipse Paho Go MQTT may incorrectly encode strings if length exceeds 65535 bytes

Details

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).

Database specific

{
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2025-12-02T17:34:33Z",
    "nvd_published_at": "2025-12-02T09:15:46Z",
    "cwe_ids": [
        "CWE-197"
    ]
}

References

Affected packages

Go / github.com/eclipse/paho.mqtt.golang

Package

Name: github.com/eclipse/paho.mqtt.golang; View open source insights on deps.dev
Purl: pkg:golang/github.com/eclipse/paho.mqtt.golang

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.5.1