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Meshtastic FirmwareOperating system · Meshtastic

CVE-2025-55292

HIGH · 8.2 CVSS v3.1 Published 2026-01-28
Fix available
A fix is available. Upgrade to 2.7.6 or later.
See remediation →
91/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Meshtastic is an open source mesh networking solution. In the current Meshtastic architecture, a Node is identified by their NodeID, generated from the MAC address, rather than their public key. This aspect downgrades the security, specifically by abusing the HAM mode which doesn't use encryption. An attacker can, as such, forge a NodeInfo on behalf of a victim node advertising that the HAM mode is enabled. This, in turn, will allow the other nodes on the mesh to accept the new information and overwriting the NodeDB. The other nodes will then only be able to send direct messages to the victim by using the shared channel key instead of the PKC. Additionally, because HAM mode by design doesn't provide any confidentiality or authentication of information, the attacker could potentially also be able to change the Node details, like the full name, short code, etc. To keep the attack persistent, it is enough to regularly resend the forged NodeInfo, in particular right after the victim sends their own. A patch is available in version 2.7.6.834c3c5.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Meshtastic FirmwareOperating system
Affected:< 2.7.6

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 2.7.6 or later
Fixed in 2.7.6
Vendor patch github.com →
Recommended fix High confidence

Firmware version 2.7.6 or later

  1. Identify the specific Meshtastic device model(s) in your deployment running firmware versions prior to 2.7.6
  2. Obtain the official Meshtastic firmware updater tool or use the flashing method appropriate for your device (typically via USB serial, Bluetooth, or OTA update)
  3. Download the fixed firmware version 2.7.6 or later from the official Meshtastic firmware releases
  4. Connect the Meshtastic device to your computer or ensure OTA update capability is available
  5. Follow the standard Meshtastic firmware flashing process to update each affected device to version 2.7.6 or newer
  6. After updating, verify the firmware version on each device confirms the upgrade was successful
  7. Monitor mesh behavior to confirm the vulnerability is remediated and nodes are properly using PKC instead of falling back to channel key for direct messages
Caveat Review Meshtastic release notes for version 2.7.6 to check for any feature changes or configuration adjustments needed post-upgrade

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,950. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-55292 in production — separate from our analysis above.

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