CVE-2026-75124 PLANET GS-4210-16P2S V3 Memory Corruption via dispatcher.cgi _readHttpParam
An unauthenticated remote attacker can cause denial of service or potential code execution on PLANET managed switches via oversized HTTP requests.
- 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-2026-75124?
CVE-2026-75124 is a high-severity memory corruption vulnerability in PLANET GS-4210-16P2S V3, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains a pre-authentication memory corruption vulnerability in the web management interface where the _readHttpParam function copies an oversized HTTP query string without guaranteeing NUL termination, allowing parse_query_string to process attacker-controlled data into a fixed-size stack buffer. An unauthenticated remote attacker can send an oversized GET request to dispatcher.cgi to cause denial of service of the web management interface and potentially trigger memory corruption.
Weakness: CWE-120
Which versions are affected by CVE-2026-75124?
How do I fix CVE-2026-75124?
No fix has been published for CVE-2026-75124 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-2026-75124 being exploited?
There is no known exploitation of CVE-2026-75124 in the wild and no public exploit code.
Sources
Also known as GHSA-fx37-w2g6-gg44.