{"schema_version":1,"title":"UltraVNC vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 4 vulnerabilities in UltraVNC: 0 in the last 7 days and 4 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-7838, was published on 1 July 2026.","url":"https://junglewise.ai/threats/technologies/ultravnc","json_url":"https://junglewise.ai/threats/technologies/ultravnc.json","publisher":"Junglewise Threat Intelligence","license":"CC-BY-4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","attribution":"Junglewise Threat Intelligence, https://junglewise.ai/threats/technologies/ultravnc","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"technology","counts":{"high":2,"all_time":4,"critical":0,"exploited":0,"last_7_days":0,"last_30_days":0,"last_90_days":4,"last_365_days":4},"latest":[{"cve":"CVE-2026-7838","cvss":8.8,"slug":"cve-2026-7838-ultravnc-viewer-heap-buffer-overflow-in-rfb-failure-response","title":"UltraVNC viewer heap buffer overflow in RFB failure-response parsing","severity":"high","exploited":false,"published_at":"2026-07-01T05:16:24.54+00:00","url":"https://junglewise.ai/threats/cve-2026-7838-ultravnc-viewer-heap-buffer-overflow-in-rfb-failure-response"},{"cve":"CVE-2026-7830","cvss":7.4,"slug":"cve-2026-7830-ultravnc-weak-cryptography-in-ms-logon-ii-authentication","title":"UltraVNC weak cryptography in MS-Logon II authentication","severity":"high","exploited":false,"published_at":"2026-07-01T05:16:24.21+00:00","url":"https://junglewise.ai/threats/cve-2026-7830-ultravnc-weak-cryptography-in-ms-logon-ii-authentication"},{"cve":"CVE-2026-44041","cvss":4.3,"slug":"cve-2026-44041-ultravnc-out-of-bounds-read-in-vncwc2mb-conversion-helper","title":"UltraVNC out-of-bounds read in vncWc2Mb conversion helper","severity":"medium","exploited":false,"published_at":"2026-07-01T05:16:21.033+00:00","url":"https://junglewise.ai/threats/cve-2026-44041-ultravnc-out-of-bounds-read-in-vncwc2mb-conversion-helper"},{"cve":"CVE-2026-44040","cvss":4.8,"slug":"cve-2026-44040-ultravnc-weak-prng-in-vnc-authentication-challenge","title":"UltraVNC weak PRNG in VNC authentication challenge","severity":"medium","exploited":false,"published_at":"2026-07-01T05:16:20.897+00:00","url":"https://junglewise.ai/threats/cve-2026-44040-ultravnc-weak-prng-in-vnc-authentication-challenge"}],"weekly":[{"week":"2026-06-29","critical":0,"exploited":0,"vulnerabilities":4},{"week":"2026-07-06","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-13","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-20","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-27","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-03","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-10","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-17","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-24","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-31","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-07","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-14","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-21","critical":0,"exploited":0,"vulnerabilities":0}],"related":[{"name":"UltraVNC Repeater","slug":"repeater","vulnerabilities":5,"url":"https://junglewise.ai/threats/technologies/repeater"}],"technology":{"hub":true,"name":"UltraVNC","slug":"ultravnc","vendor":{"name":"UltraVNC","slug":"ultravnc","url":"https://junglewise.ai/threats/vendors/ultravnc"},"aliases":[],"category":"application","homepage":"https://uvnc.com/","repo_url":"https://github.com/ultravnc/ultravnc","description":"UltraVNC is a powerful, easy to use and free software that can display the screen of another computer (via internet or network) on your own screen.","url":"https://junglewise.ai/threats/technologies/ultravnc"},"most_severe":[{"cve":"CVE-2026-7838","cvss":8.8,"slug":"cve-2026-7838-ultravnc-viewer-heap-buffer-overflow-in-rfb-failure-response","title":"UltraVNC viewer heap buffer overflow in RFB failure-response parsing","severity":"high","exploited":false,"published_at":"2026-07-01T05:16:24.54+00:00","url":"https://junglewise.ai/threats/cve-2026-7838-ultravnc-viewer-heap-buffer-overflow-in-rfb-failure-response"},{"cve":"CVE-2026-7830","cvss":7.4,"slug":"cve-2026-7830-ultravnc-weak-cryptography-in-ms-logon-ii-authentication","title":"UltraVNC weak cryptography in MS-Logon II authentication","severity":"high","exploited":false,"published_at":"2026-07-01T05:16:24.21+00:00","url":"https://junglewise.ai/threats/cve-2026-7830-ultravnc-weak-cryptography-in-ms-logon-ii-authentication"},{"cve":"CVE-2026-44040","cvss":4.8,"slug":"cve-2026-44040-ultravnc-weak-prng-in-vnc-authentication-challenge","title":"UltraVNC weak PRNG in VNC authentication challenge","severity":"medium","exploited":false,"published_at":"2026-07-01T05:16:20.897+00:00","url":"https://junglewise.ai/threats/cve-2026-44040-ultravnc-weak-prng-in-vnc-authentication-challenge"},{"cve":"CVE-2026-44041","cvss":4.3,"slug":"cve-2026-44041-ultravnc-out-of-bounds-read-in-vncwc2mb-conversion-helper","title":"UltraVNC out-of-bounds read in vncWc2Mb conversion helper","severity":"medium","exploited":false,"published_at":"2026-07-01T05:16:21.033+00:00","url":"https://junglewise.ai/threats/cve-2026-44041-ultravnc-out-of-bounds-read-in-vncwc2mb-conversion-helper"}],"generated_at":"2026-09-26T09:11:00.170868+00:00"}