CVE-2026-76852 Netcore NR268 1.7.121109 Forgeable Firmware Authenticity Check in mtd_write
Attackers can bypass firmware signature validation on Netcore NR268 routers to load unauthorized firmware, enabling code execution and privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-76852?
CVE-2026-76852 is a high-severity vulnerability in Netcore NR268, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Netcore NR268 firmware version 1.7.121109 has an improper integrity verification flaw in mtd_write allowing forged firmware authenticity checks. Attackers can exploit put_file.cgi and check_image_uuid.c to bypass firmware signature validation and load unauthorized firmware images.
Weakness: CWE-354
Which versions are affected by CVE-2026-76852?
How do I fix CVE-2026-76852?
No fix has been published for CVE-2026-76852 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-76852 being exploited?
There is no known exploitation of CVE-2026-76852 in the wild and no public exploit code.
Sources
Also known as GHSA-6645-rfg8-rhrm.