CVE-2026-84420 Out-of-Bounds Write and Out-of-Bounds Read
An out-of-bounds read and write vulnerability in Citrix Workspace app for Windows allows attackers to potentially execute code or cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84420?
CVE-2026-84420 is a medium-severity memory corruption vulnerability in Citirx Citrix Workspace app for Windows, published on 13 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Out-of-bounds read vulnerability in Citirx Citrix Workspace app for Windows.
This issue affects Citrix Workspace app for Windows: before 2603.20 CR, before LTSR 2607, and before LTSR 2507 CU3.
Weakness: CWE-125
Which versions are affected by CVE-2026-84420?
How do I fix CVE-2026-84420?
No fix has been published for CVE-2026-84420 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-2026-84420 being exploited?
There is no known exploitation of CVE-2026-84420 in the wild and no public exploit code.
Sources
Also known as GHSA-48h6-7293-hxh6.