Vulnerability · Published Aug 18, 2025 · Assigned by GitHub_M

CVE-2025-55293Meshtastic allows crafting of specific NodeInfo packets that overwrite any publicKey saved in the NodeDB

Critical 9.4

In plain English

A critical-severity improper authentication in firmware from meshtastic. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities).

Severity (CVSS 3.1)9.4Critical

Exploit odds (30 days)0.5%top 60.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
meshtastic	firmware	< 2.6.3

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

References

https://github.com/meshtastic/firmware/security/advisories/GHSA-95pq-gj5v-4fg2 x_refsource_CONFIRM
https://github.com/meshtastic/firmware/pull/6372 x_refsource_MISC
https://github.com/meshtastic/firmware/commit/cf7f0f9d0895602df3453a4f5cfea843f4e09744 x_refsource_MISC