Encoding Flaw in Eclipse Paho Go MQTT Library Affects Data Transmission
CVE-2025-10543

6.3MEDIUM

Key Information:

Vendor

Eclipse Foundation

Status
Paho.MQtt.golang (go MQtt V3.1 Library)
Vendor
CVE Published:
2 December 2025

What is CVE-2025-10543?

The Eclipse Paho Go MQTT library, specifically versions up to 1.5.0, contains an encoding flaw related to UTF-8 strings. When strings exceed 65535 bytes, the conversion from an int64/int32 to an int16 fails to adequately check for overflows, resulting in potential packet corruption. This flaw may cause data intended for one field to unintentionally appear in another, which can lead to the leakage of sensitive information, particularly where an MQTT topic spills into the message body during packet transmission.

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Affected Version(s)

paho.mqtt.golang (Go MQTT v3.1 library) 0 <= 1.5.0

References

https://gitlab.eclipse.org/security/vulnerability-reports...

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Paul Gerste
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