CVE-2026-4962 UltraVNC Service version.dll uncontrolled search path
Local attackers can exploit an uncontrolled search path in UltraVNC Service to execute arbitrary code or escalate privileges.
- 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-2026-4962?
CVE-2026-4962 is a high-severity vulnerability in UltraVNC, published on 27 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A security flaw has been discovered in UltraVNC up to 1.6.4.0. Affected by this issue is some unknown functionality in the library version.dll of the component Service. The manipulation results in uncontrolled search path. The attack needs to be approached locally. This attack is characterized by high complexity. The exploitation is known to be difficult. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-4962?
It affects 1 product.
Products include Uvnc Ultravnc.
How do I fix CVE-2026-4962?
No fix has been published for CVE-2026-4962 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-4962 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4962 exists.
Other vulnerabilities in UltraVNC
Sources
Also known as GHSA-x2c8-7fp3-5gg6.