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Advisory record · GHSA-32fw-gq77-f2f2

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

CVSS 6.3 MediumEPSS 0.0024 · 15th percentile

Published by the GitHub Advisory Database at 2 Dec 2025, 09:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/eclipse/paho.mqtt.golangGo<1.5.11.5.1
Identifiers
GHSA-32fw-gq77-f2f2 · CVE-2025-10543 · GO-2025-4173
Weakness (CWE)
CWE-197 · CWE-681
Tags
Published
2 Dec 2025
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Eclipse Paho Go MQTT (github.com/eclipse/paho.mqtt.golang) versions before 1.5.1 may incorrectly encode UTF-8 strings longer than 65535 bytes, because the length field overflows. This can produce corrupt packets or cause excess data, such as part of a topic, to appear in another field like the PUBLISH message body. The source does not say what an attacker must control to trigger this. Upgrade to version 1.5.1 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.3 Medium 4.0 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 CNA (eclipse)
  • CISA KEV Not listed.
  • EPSS 0.0024, the 15th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:14 UTC First seen by agentprime
  2. 31 Oct 2026, 14:14 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.