---
title: "CVE-2026-76870: Netcore NR255-V - Out of Bounds Read"
description: "Netcore NR255-V 1.5.130703 contains an out-of-bounds read vulnerability caused by short firmware uploads in the mtd_write pre-flash validation routine, letting attackers trigger out-of-bounds reads via truncated firmware upload."
url: https://panop.io/threat-heartbeat/CVE-2026-76870/
---

# CVE-2026-76870 Netcore NR255-V - Out of Bounds Read

Netcore NR255-V 1.5.130703 contains an out-of-bounds read vulnerability caused by short firmware uploads in the mtd\_write pre-flash validation routine, letting attackers trigger out-of-bounds reads via truncated firmware upload.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.40% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-76870)

## Details

Type

Out of Bounds Read

Impact

Information Disclosure

CVSS vector

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

Published

15 September 2026

Updated

15 October 2026

Weakness

[CWE-125](https://cwe.mitre.org/data/definitions/125.html)

## Vendor fix

Update to the latest version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-76870](https://nvd.nist.gov/vuln/detail/CVE-2026-76870)
- [https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-firmware-upload-oob.md](https://github.com/draw-ctf/netcore-router-public-refs/blob/main/2026.08.19-netcore-nr255v-firmware-upload-oob.md)
- [https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-out-of-bounds-read-in-mtd-write-firmware-upload-validation](https://www.vulncheck.com/advisories/netcore-nr255-v-1.5.130703-out-of-bounds-read-in-mtd-write-firmware-upload-validation)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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