CVE-2026-101039 FAST FAC1900R devdiscover Service copy_msg_element stack-based overflow
Remote attackers can exploit a stack-based buffer overflow in the devdiscover service to execute arbitrary code on FAST FAC1900R devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-101039?
CVE-2026-101039 is a critical memory corruption vulnerability in FAST FAC1900R, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was identified in FAST FAC1900R 20190827_2.0.2. Affected by this issue is the function copy_msg_element of the component devdiscover Service. Such manipulation leads to stack-based buffer overflow. The attack can be executed remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-101039?
How do I fix CVE-2026-101039?
No fix has been published for CVE-2026-101039 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-101039 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101039 exists.
Sources
Also known as GHSA-6x6g-w7q4-663p.