{"id":"CVE-2026-107613","state":"PUBLISHED","title":"NULL pointer dereference in TightVNC Server Win8ScreenDriver after failed DXGI re-initialization","description":"A NULL pointer dereference vulnerability in the Win8ScreenDriver component of GlavSoft TightVNC Server for Windows before 2.8.88 allows an attacker to crash the server, causing a denial of service. When re-initialization of the DXGI Desktop Duplication driver fails in applyNewScreenProperties() (for example after a GPU reset, display hot-plug or session change), m_drvImpl is left NULL and is subsequently dereferenced without a check by executeDetection(), getScreenBuffer(), grabFb(), getScreenPropertiesChanged() and getCursorPosition().","publishedAt":"2026-10-08T13:39:56.972Z","updatedAt":"2026-10-08T14:01:33.803Z","severity":{"score":5.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"securin"},"assigner":"securin","products":["GlavSoft TightVNC"],"affected":[{"vendor":"GlavSoft","product":"TightVNC","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2.8.88","versionType":"custom"}],"platforms":["Windows"],"modules":["TightVNC Server (Win8/DXGI screen driver)"],"programFiles":["Win8ScreenDriver.cpp"],"programRoutines":[{"name":"Win8ScreenDriver::applyNewScreenProperties()"},{"name":"Win8ScreenDriver::executeDetection()"},{"name":"Win8ScreenDriver::getScreenBuffer()"},{"name":"Win8ScreenDriver::grabFb()"},{"name":"Win8ScreenDriver::getScreenPropertiesChanged()"},{"name":"Win8ScreenDriver::getCursorPosition()"}]}],"references":["https://sourceforge.net/p/vnc-tight/bugs/1660/","https://www.tightvnc.com/whatsnew.php"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:10:23.711Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/107xxx/CVE-2026-107613.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-107613","state":"PUBLISHED","datePublished":"2026-10-08T13:39:56.972Z","dateUpdated":"2026-10-08T14:01:33.803Z","assignerShortName":"securin","assignerOrgId":"33c584b5-0579-4c06-b2a0-8d8329fcab9c","dateReserved":"2026-10-08T13:23:07.677Z"},"containers":{"cna":{"title":"NULL pointer dereference in TightVNC Server Win8ScreenDriver after failed DXGI re-initialization","descriptions":[{"lang":"en","value":"A NULL pointer dereference vulnerability in the Win8ScreenDriver component of GlavSoft TightVNC Server for Windows before 2.8.88 allows an attacker to crash the server, causing a denial of service. When re-initialization of the DXGI Desktop Duplication driver fails in applyNewScreenProperties() (for example after a GPU reset, display hot-plug or session change), m_drvImpl is left NULL and is subsequently dereferenced without a check by executeDetection(), getScreenBuffer(), grabFb(), getScreenPropertiesChanged() and getCursorPosition()."}],"affected":[{"vendor":"GlavSoft","product":"TightVNC","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2.8.88","versionType":"custom"}],"platforms":["Windows"],"modules":["TightVNC Server (Win8/DXGI screen driver)"],"programFiles":["Win8ScreenDriver.cpp"],"programRoutines":[{"name":"Win8ScreenDriver::applyNewScreenProperties()"},{"name":"Win8ScreenDriver::executeDetection()"},{"name":"Win8ScreenDriver::getScreenBuffer()"},{"name":"Win8ScreenDriver::grabFb()"},{"name":"Win8ScreenDriver::getScreenPropertiesChanged()"},{"name":"Win8ScreenDriver::getCursorPosition()"}]}],"references":[{"url":"https://sourceforge.net/p/vnc-tight/bugs/1660/","name":"TightVNC bug #1660","tags":["issue-tracking"]},{"url":"https://www.tightvnc.com/whatsnew.php","name":"TightVNC release notes (2.8.88)","tags":["release-notes","patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":5.9,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","type":"CWE","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"securin","orgId":"33c584b5-0579-4c06-b2a0-8d8329fcab9c","dateUpdated":"2026-10-08T13:39:56.972Z"},"solutions":[{"lang":"en","value":"Upgrade TightVNC for Windows to version 2.8.88 or later."}],"credits":[{"lang":"en","type":"finder","value":"Arjun Basnet from Securin"}],"timeline":[{"time":"2026-05-30T00:00:00.000Z","lang":"en","value":"Reported to GlavSoft"},{"time":"2026-06-02T00:00:00.000Z","lang":"en","value":"Vendor acknowledged"},{"time":"2026-06-19T00:00:00.000Z","lang":"en","value":"TightVNC 2.8.88 released with fix"}],"source":{"discovery":"EXTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-08T14:01:21.134363Z","id":"CVE-2026-107613","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-08T14:01:33.803Z"}}]}}}