CVE-2026-107614 (GCVE-0-2026-107614)
Vulnerability from cvelistv5
Published
2026-10-08 13:39
Modified
2026-10-08 14:01
Severity ?
VLAI Severity ?
EPSS score ?
Summary
An integer underflow in WinCursorShapeUtils::trimTransparent() in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to crash the server, and potentially read out-of-bounds memory, by causing a cursor shape with a width or height of zero to be processed on the DXGI capture path. The loop bound width - 1 wraps to 0xFFFFFFFF, producing an access roughly 4 GB beyond the 64 KB cursor buffer; a monochrome cursor of height 1 also becomes 0 because getCursorHeight() halves the height in place.
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-107614",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-08T14:00:49.369592Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-10-08T14:01:01.624Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"modules": [
"TightVNC Server (cursor shape processing)"
],
"platforms": [
"Windows"
],
"product": "TightVNC",
"programFiles": [
"WinCursorShapeUtils.cpp"
],
"programRoutines": [
{
"name": "WinCursorShapeUtils::trimTransparent()"
},
{
"name": "getCursorHeight()"
}
],
"vendor": "GlavSoft",
"versions": [
{
"lessThan": "2.8.88",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Arjun Basnet from Securin"
}
],
"descriptions": [
{
"lang": "en",
"value": "An integer underflow in WinCursorShapeUtils::trimTransparent() in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to crash the server, and potentially read out-of-bounds memory, by causing a cursor shape with a width or height of zero to be processed on the DXGI capture path. The loop bound width - 1 wraps to 0xFFFFFFFF, producing an access roughly 4 GB beyond the 64 KB cursor buffer; a monochrome cursor of height 1 also becomes 0 because getCursorHeight() halves the height in place."
}
],
"impacts": [
{
"capecId": "CAPEC-540",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-540 Overread Buffers"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-191",
"description": "CWE-191 Integer Underflow (Wrap or Wraparound)",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-125",
"description": "CWE-125 Out-of-bounds Read",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-08T13:39:58.297Z",
"orgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c",
"shortName": "securin"
},
"references": [
{
"name": "TightVNC bug #1661",
"tags": [
"issue-tracking"
],
"url": "https://sourceforge.net/p/vnc-tight/bugs/1661/"
},
{
"name": "TightVNC release notes (2.8.88)",
"tags": [
"release-notes",
"patch"
],
"url": "https://www.tightvnc.com/whatsnew.php"
}
],
"solutions": [
{
"lang": "en",
"value": "Upgrade TightVNC for Windows to version 2.8.88 or later."
}
],
"source": {
"discovery": "EXTERNAL"
},
"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"
}
],
"title": "Integer underflow in TightVNC Server cursor shape trimming leads to out-of-bounds read"
}
},
"cveMetadata": {
"assignerOrgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c",
"assignerShortName": "securin",
"cveId": "CVE-2026-107614",
"datePublished": "2026-10-08T13:39:58.297Z",
"dateReserved": "2026-10-08T13:23:07.677Z",
"dateUpdated": "2026-10-08T14:01:01.624Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-107614\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-08T14:00:49.369592Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-08T14:00:55.983Z\"}}], \"cna\": {\"title\": \"Integer underflow in TightVNC Server cursor shape trimming leads to out-of-bounds read\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Arjun Basnet from Securin\"}], \"impacts\": [{\"capecId\": \"CAPEC-540\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-540 Overread Buffers\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 6.1, \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"GlavSoft\", \"modules\": [\"TightVNC Server (cursor shape processing)\"], \"product\": \"TightVNC\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.8.88\", \"versionType\": \"custom\"}], \"platforms\": [\"Windows\"], \"programFiles\": [\"WinCursorShapeUtils.cpp\"], \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"WinCursorShapeUtils::trimTransparent()\"}, {\"name\": \"getCursorHeight()\"}]}], \"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/1661/\", \"name\": \"TightVNC bug #1661\", \"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\": \"An integer underflow in WinCursorShapeUtils::trimTransparent() in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to crash the server, and potentially read out-of-bounds memory, by causing a cursor shape with a width or height of zero to be processed on the DXGI capture path. The loop bound width - 1 wraps to 0xFFFFFFFF, producing an access roughly 4 GB beyond the 64 KB cursor buffer; a monochrome cursor of height 1 also becomes 0 because getCursorHeight() halves the height in place.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-191\", \"description\": \"CWE-191 Integer Underflow (Wrap or Wraparound)\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"33c584b5-0579-4c06-b2a0-8d8329fcab9c\", \"shortName\": \"securin\", \"dateUpdated\": \"2026-10-08T13:39:58.297Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-107614\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-08T14:01:01.624Z\", \"dateReserved\": \"2026-10-08T13:23:07.677Z\", \"assignerOrgId\": \"33c584b5-0579-4c06-b2a0-8d8329fcab9c\", \"datePublished\": \"2026-10-08T13:39:58.297Z\", \"assignerShortName\": \"securin\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…