CVE-2026-8764 H3C Magic B3 aspForm UpdateWanParams buffer overflow
Remote attackers can trigger a buffer overflow in the UpdateWanParams function of H3C Magic B3 routers, potentially leading to code execution or service disruption.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8764?
CVE-2026-8764 is a high-severity memory corruption vulnerability in H3C Magic B3, published on 17 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A security vulnerability has been detected in H3C Magic B3 up to 100R002. This affects the function UpdateWanParams of the file /goform/aspForm. Such manipulation of the argument param leads to buffer overflow. The attack may be performed from remote. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-8764?
How do I fix CVE-2026-8764?
No fix has been published for CVE-2026-8764 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-2026-8764 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8764 exists.
Sources
Also known as GHSA-fgq5-p2r5-jrm5.