CVE-2026-7838
A remote, anonymous attacker can exploit multiple vulnerabilities in UltraVNC to execute arbitrary code, disclose confidential information, manipulate data, and cause a denial of service.
CSIRTS triage
- What
- A remote, anonymous attacker can exploit multiple vulnerabilities in UltraVNC to execute arbitrary code, disclose confidential information, manipulate data, and cause a denial of service.
- Who is affected
- Deployments of UltraVNC.
- Urgency
- Remediation is high urgency due to the severity of the vulnerabilities and potential impacts.
- Action
- Apply patches or updates as soon as they are available.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2026-7838
Get an email if CVE-2026-7838 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Moderate exploitation risk1.4% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 69% of all EPSS-scored CVEs.
Advisory coverage (2)
- high[NEW] [high] UltraVNC: Multiple vulnerabilitiescert-bund · 2026-07-01
- highCVE-2026-7838: UltraVNC viewer through 1.8.2.2 contains an integer overflow leading to a heap buffer overflow …nvd · 2026-07-01
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-7838)