CVE-2025-55292Public exploitNetwork attack vector

Message confidentiality loss via forged HAM-mode NodeInfo

Published Jan 27, 2026 · Updated Jan 27, 2026

Improper source validation in Meshtastic Firmware 2.6.2 and earlier allows remote attackers to downgrade direct-message confidentiality. NodeDB::updateUser accepts NodeInfo for an existing NodeID without rejecting a missing or mismatched public key, allowing forged HAM-mode data to overwrite trusted node details. Mesh reachability is sufficient; repeated advertisements sustain the downgrade, force direct messages onto the shared channel key, and permit node-detail changes.

CVSS severity8.2
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper source validation in Meshtastic Firmware 2.6.2 and earlier allows remote attackers to downgrade direct-message confidentiality. NodeDB::updateUser accepts NodeInfo for an existing NodeID without rejecting a missing or mismatched public key, allowing forged HAM-mode data to overwrite trusted node details. Mesh reachability is sufficient; repeated advertisements sustain the downgrade, force direct messages onto the shared channel key, and permit node-detail changes.

The record

CVE
CVE-2025-55292
Published
Jan 27, 2026
Updated
Jan 27, 2026
Vendor
Meshtastic
Product
Meshtastic Firmware
Classifications
CWE-348, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 2.6.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Meshtastic · Meshtastic Firmwareversion=<= 2.6.2

Published CVSS scores

8.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-348Use of Less Trusted Source
T1565.002Transmitted Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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