# UltraVNC Repeater vulnerabilities

Source: https://junglewise.ai/threats/technologies/repeater  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/repeater.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 5 vulnerabilities in UltraVNC Repeater: 0 in the last 7 days and 0 in the last 90 days, 2 of them critical and 0 exploited in the wild. The most recent, CVE-2026-7840, was published on 1 July 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 5 (2 critical, 0 exploited in the wild)

## About UltraVNC Repeater

A proxy server component for UltraVNC that acts as a gateway for VNC viewer and server connections.

## Latest UltraVNC Repeater vulnerabilities

- [CVE-2026-7840: UltraVNC Repeater global buffer overflow in HTTP administration server](https://junglewise.ai/threats/cve-2026-7840-ultravnc-repeater-global-buffer-overflow-in-http-administration) (critical, CVSS 9.8, published 1 Jul 2026)
- [CVE-2026-7839: UltraVNC Repeater hardcoded password in HTTP administration server](https://junglewise.ai/threats/cve-2026-7839-ultravnc-repeater-hardcoded-password-in-http-administration-server) (critical, CVSS 9.1, published 1 Jul 2026)
- [CVE-2026-7829: UltraVNC Repeater out-of-bounds write in allow/deny rule parser](https://junglewise.ai/threats/cve-2026-7829-ultravnc-repeater-out-of-bounds-write-in-allow-deny-rule-parser) (high, CVSS 7.2, published 1 Jul 2026)
- [CVE-2026-7828: UltraVNC Repeater integer overflow in HTTP request logging](https://junglewise.ai/threats/cve-2026-7828-ultravnc-repeater-integer-overflow-in-http-request-logging) (medium, CVSS 5.3, published 1 Jul 2026)
- [CVE-2026-44042: UltraVNC Repeater off-by-one error in HTTP Basic authentication](https://junglewise.ai/threats/cve-2026-44042-ultravnc-repeater-off-by-one-error-in-http-basic-authentication) (low, CVSS 3.7, published 1 Jul 2026)

## Most severe UltraVNC Repeater vulnerabilities

- [CVE-2026-7840: UltraVNC Repeater global buffer overflow in HTTP administration server](https://junglewise.ai/threats/cve-2026-7840-ultravnc-repeater-global-buffer-overflow-in-http-administration) (critical, CVSS 9.8, published 1 Jul 2026)
- [CVE-2026-7839: UltraVNC Repeater hardcoded password in HTTP administration server](https://junglewise.ai/threats/cve-2026-7839-ultravnc-repeater-hardcoded-password-in-http-administration-server) (critical, CVSS 9.1, published 1 Jul 2026)
- [CVE-2026-7829: UltraVNC Repeater out-of-bounds write in allow/deny rule parser](https://junglewise.ai/threats/cve-2026-7829-ultravnc-repeater-out-of-bounds-write-in-allow-deny-rule-parser) (high, CVSS 7.2, published 1 Jul 2026)
- [CVE-2026-7828: UltraVNC Repeater integer overflow in HTTP request logging](https://junglewise.ai/threats/cve-2026-7828-ultravnc-repeater-integer-overflow-in-http-request-logging) (medium, CVSS 5.3, published 1 Jul 2026)
- [CVE-2026-44042: UltraVNC Repeater off-by-one error in HTTP Basic authentication](https://junglewise.ai/threats/cve-2026-44042-ultravnc-repeater-off-by-one-error-in-http-basic-authentication) (low, CVSS 3.7, published 1 Jul 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other UltraVNC technologies

- [UltraVNC](https://junglewise.ai/threats/technologies/ultravnc): 4 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "UltraVNC Repeater vulnerabilities", https://junglewise.ai/threats/technologies/repeater, 9 November 2026.