CVE-2026-107612

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-107612", "assignerOrgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "state": "PUBLISHED", "assignerShortName": "securin", "dateReserved": "2026-10-08T13:23:07.677Z", "datePublished": "2026-10-08T13:39:55.702Z", "dateUpdated": "2026-10-08T14:02:27.703Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "shortName": "securin", "dateUpdated": "2026-10-08T13:39:55.702Z"}, "title": "World-accessible IPC shared memory with predictable name in TightVNC Server", "descriptions": [{"lang": "en", "value": "Incorrect permission assignment in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to read or overwrite the inter-process communication handles used between the TightVNC service and its desktop server process. The named shared memory segment in the Global\\ namespace that carries the pipe HANDLE values is created with a NULL DACL, and its name is derived from a time-seeded srand(time(0)) value that is predictable to one-second granularity. A low-privileged local process can open the mapping and tamper with the IPC channel of a service running as SYSTEM, potentially leading to disclosure of session data, privilege escalation, or denial of service."}], "affected": [{"vendor": "GlavSoft", "product": "TightVNC", "platforms": ["Windows"], "modules": ["TightVNC Server (desktop server IPC)"], "programFiles": ["SharedMemory.cpp", "DesktopServerWatcher.cpp"], "programRoutines": [{"name": "DesktopServerWatcher::execute()"}], "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThan": "2.8.88", "status": "affected", "versionType": "custom"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-732", "description": "CWE-732 Incorrect Permission Assignment for Critical Resource"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-338", "description": "CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)"}]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}}], "solutions": [{"lang": "en", "value": "Upgrade TightVNC for Windows to version 2.8.88 or later."}], "references": [{"url": "https://sourceforge.net/p/vnc-tight/bugs/1658/", "name": "TightVNC bug #1658", "tags": ["issue-tracking"]}, {"url": "https://www.tightvnc.com/whatsnew.php", "name": "TightVNC release notes (2.8.88)", "tags": ["release-notes", "patch"]}], "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"}, "impacts": [{"capecId": "CAPEC-122", "descriptions": [{"lang": "en", "value": "CAPEC-122 Privilege Abuse"}]}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-08T14:01:50.062814Z", "id": "CVE-2026-107612", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-08T14:02:27.703Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-107612", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-08T14:01:50.062814Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-08T14:01:55.171Z"}}], "cna": {"title": "World-accessible IPC shared memory with predictable name in TightVNC Server", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Arjun Basnet from Securin"}], "impacts": [{"capecId": "CAPEC-122", "descriptions": [{"lang": "en", "value": "CAPEC-122 Privilege Abuse"}]}], "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "GlavSoft", "modules": ["TightVNC Server (desktop server IPC)"], "product": "TightVNC", "versions": [{"status": "affected", "version": "0", "lessThan": "2.8.88", "versionType": "custom"}], "platforms": ["Windows"], "programFiles": ["SharedMemory.cpp", "DesktopServerWatcher.cpp"], "defaultStatus": "unaffected", "programRoutines": [{"name": "DesktopServerWatcher::execute()"}]}], "timeline": [{"lang": "en", "time": "2026-05-30T00:00:00.000Z", "value": "Reported to GlavSoft"}, {"lang": "en", "time": "2026-06-02T00:00:00.000Z", "value": "Vendor acknowledged"}, {"lang": "en", "time": "2026-06-19T00:00:00.000Z", "value": "TightVNC 2.8.88 released with fix"}], "solutions": [{"lang": "en", "value": "Upgrade TightVNC for Windows to version 2.8.88 or later."}], "references": [{"url": "https://sourceforge.net/p/vnc-tight/bugs/1658/", "name": "TightVNC bug #1658", "tags": ["issue-tracking"]}, {"url": "https://www.tightvnc.com/whatsnew.php", "name": "TightVNC release notes (2.8.88)", "tags": ["release-notes", "patch"]}], "descriptions": [{"lang": "en", "value": "Incorrect permission assignment in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to read or overwrite the inter-process communication handles used between the TightVNC service and its desktop server process. The named shared memory segment in the Global\\ namespace that carries the pipe HANDLE values is created with a NULL DACL, and its name is derived from a time-seeded srand(time(0)) value that is predictable to one-second granularity. A low-privileged local process can open the mapping and tamper with the IPC channel of a service running as SYSTEM, potentially leading to disclosure of session data, privilege escalation, or denial of service."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-732", "description": "CWE-732 Incorrect Permission Assignment for Critical Resource"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-338", "description": "CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)"}]}], "providerMetadata": {"orgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "shortName": "securin", "dateUpdated": "2026-10-08T13:39:55.702Z"}}}, "cveMetadata": {"cveId": "CVE-2026-107612", "state": "PUBLISHED", "dateUpdated": "2026-10-08T14:02:27.703Z", "dateReserved": "2026-10-08T13:23:07.677Z", "assignerOrgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "datePublished": "2026-10-08T13:39:55.702Z", "assignerShortName": "securin"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "modules": ["TightVNC Server (desktop server IPC)"], "platforms": ["Windows"], "product": "TightVNC", "programFiles": ["SharedMemory.cpp", "DesktopServerWatcher.cpp"], "programRoutines": [{"name": "DesktopServerWatcher::execute()"}], "vendor": "GlavSoft", "versions": [{"lessThan": "2.8.88", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Incorrect permission assignment in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to read or overwrite the inter-process communication handles used between the TightVNC service and its desktop server process. The named shared memory segment in the Global\\ namespace that carries the pipe HANDLE values is created with a NULL DACL, and its name is derived from a time-seeded srand(time(0)) value that is predictable to one-second granularity. A low-privileged local process can open the mapping and tamper with the IPC channel of a service running as SYSTEM, potentially leading to disclosure of session data, privilege escalation, or denial of service."}], "id": "CVE-2026-107612", "lastModified": "2026-10-08T21:10:00.133", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-107612", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-08T14:01:50.062814Z", "version": "2.0.3"}}]}, "published": "2026-10-08T14:16:49.877", "references": [{"source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "url": "https://sourceforge.net/p/vnc-tight/bugs/1658/"}, {"source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "url": "https://www.tightvnc.com/whatsnew.php"}], "sourceIdentifier": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-338"}, {"lang": "en", "value": "CWE-732"}], "source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["windows"], "status": "affected", "versions": {"scheme": "generic", "value": "[0,2.8.88)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "TightVNC", "source": "cna", "vendor": "GlavSoft"}, "product": "tightvnc", "vendor": "glavsoft"}], "created": "2026-10-08T17:00:18.607953+00:00", "updated": "2026-10-09T08:05:08.369531+00:00", "vendors": ["glavsoft", "glavsoft$PRODUCT$tightvnc"]}