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

> Attackers can overwrite stored public keys in Meshtastic firmware by sending crafted NodeInfo packets, bypassing authentication checks and impersonating nodes.

- **Severity:** Critical 9.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Aug 2025
- **Updated:** 18 Aug 2025
- **Also known as:** GHSA-95pq-gj5v-4fg2

## What is CVE-2025-55293?

CVE-2025-55293 is a critical authentication bypass vulnerability in meshtastic firmware, published on 18 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### 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.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2025-55293?

It affects 1 product.


Products: Meshtastic Meshtastic Firmware.

## How do I fix CVE-2025-55293?

No fix has been published for CVE-2025-55293 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-55293 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-55293 exists.

## Other vulnerabilities in meshtastic firmware

- [CVE-2025-52464](https://insights.sbomify.com/CVE-2025-52464/): Meshtastic Repeated Public and Private Keypairs (critical 9.5)
- [CVE-2025-24797](https://insights.sbomify.com/CVE-2025-24797/): Meshtastic incorrectly hands malformed packets leads to controlled buffer overflow (critical 9.4)
- [CVE-2025-55292](https://insights.sbomify.com/CVE-2025-55292/): In Meshtastic, an attacker can spoof licensed amateur flag for a node (high 8.2)
- [CVE-2024-47078](https://insights.sbomify.com/CVE-2024-47078/): Meshtastic firmware Authentication/Authorization Bypass via MQTT (high 8.1)
- [CVE-2026-42566](https://insights.sbomify.com/CVE-2026-42566/): Meshtastic: Malformed UTF-8 in User.long_name broadcast over LoRa causes mesh-wide client decode failure (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-55293 and fix it if it is affected.

What it is: CVE-2025-55293 is a critical authentication bypass vulnerability in meshtastic firmware, published on 18 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-55293 exists.

Affected product: meshtastic firmware. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-55293/ (Markdown: https://insights.sbomify.com/CVE-2025-55293/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-55293
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-55293
- OSV: https://osv.dev/vulnerability/CVE-2025-55293

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-55293/
Summaries are generated and may contain mistakes; the official description above is the record.