CVE-2026-102761 Memory corruption in NetX Duo
A memory corruption vulnerability in NetX Duo's WebSocket client allows attackers to execute arbitrary code or cause denial of service via crafted masked frames.
- 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-2026-102761?
CVE-2026-102761 is a critical memory corruption vulnerability in Eclipse Foundation NetX Duo, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
NetX Duo's WebSocket client resets the unmasking cursor to the first `NX_PACKET` each time it advances through a chained packet, while the loop's upper bound belongs to the current packet. With the standard contiguous packet-pool layout, a masked server frame split across two packets therefore drives the XOR loop through the first packet's unused payload area and on through the second packet's `NX_PACKET` control block.
The four-byte WebSocket masking key controls the bytes written, so the corruption is attacker-chosen rather than incidental.
Weakness: CWE-787
Which versions are affected by CVE-2026-102761?
How do I fix CVE-2026-102761?
No fix has been published for CVE-2026-102761 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-2026-102761 being exploited?
There is no known exploitation of CVE-2026-102761 in the wild and no public exploit code.
Sources
Also known as GHSA-6xgx-v7gw-qjph, GHSA-mjm4-7228-hgjf.