CVE-2025-55293
Critical
Description
Meshtastic is an open source mesh networking solution. Prior to v2.6.3, an attacker can send NodeInfo with a empty publicKey first, then overwrite it with a new key. First sending a empty key bypasses 'if (p.public_key.size > 0) {', clearing the existing publicKey (and resetting the size to 0) for a known node. Then a new key bypasses 'if (info->user.public_key.size > 0) {', and this malicious key is stored in NodeDB. This vulnerability is fixed in 2.6.3.
SeverityCritical
CVSS9.4
Exploit probability—
ProductMeshtastic Firmware
PublishedAug 18, 2025
First seenAug 18, 2025
Weakness typeCWE-287Improper authentication
How to fix
Update
- meshtastic meshtastic_firmware2.6.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| meshtastic meshtastic_firmware | v < 2.6.3 | 2.6.3 |
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