CVE-2026-6045
Heap buffer overflow in EMF+ gradient brush import
Medium 5.4
LibreOffice can import EMF+ graphics, which may be embedded in documents. A heap buffer overflow existed when importing an EMF+ gradient brush. The number of gradient blend points was read from the file and used to compute an allocation size, but that multiplication could overflow, so a small buffer was allocated and then filled as if it were large, writing past its end. In fixed versions the blend-point count is checked against the data actually available before allocating.
Assigner
Document Fdn.
Document Fdn.
Published
2026-06-15
2026-06-15
Updated
2026-10-21
2026-10-21
Reserved
2026-04-09
2026-04-09
Scores
| Source | CVSS | Score | Severity | Vector |
|---|---|---|---|---|
| Document Fdn. | 4.0 | 5.4 | Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P |
Weaknesses
Affected
| Vendor | Product | Versions |
|---|---|---|
| The Document Foundation | LibreOffice | 25.8 to < < 25.8.7 (affected) 26.2 to < < 26.2.3 (affected) others: unknown |
References
Full CVE JSON record (5.2)
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-6045",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-15T18:12:50.303654Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-06-15T18:13:24.274Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "LibreOffice",
"vendor": "The Document Foundation",
"versions": [
{
"lessThan": "\u003c 25.8.7",
"status": "affected",
"version": "25.8",
"versionType": "25.8 series"
},
{
"lessThan": "\u003c 26.2.3",
"status": "affected",
"version": "26.2",
"versionType": "26.2 series"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Anthropic (automated discovery using Claude)"
},
{
"lang": "en",
"type": "analyst",
"value": "Trail of Bits (triage and validation)"
},
{
"lang": "en",
"type": "finder",
"value": "Anonymous working with TrendAI Zero Day Initiative"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Caol\u00e1n McNamara of Collabora Productivity"
}
],
"datePublic": "2026-06-15T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eLibreOffice can import EMF+ graphics, which may be embedded in documents. A heap buffer overflow existed when importing an EMF+ gradient brush. The number of gradient blend points was read from the file and used to compute an allocation size, but that multiplication could overflow, so a small buffer was allocated and then filled as if it were large, writing past its end. In fixed versions the blend-point count is checked against the data actually available before allocating.\u003c/p\u003e"
}
],
"value": "LibreOffice can import EMF+ graphics, which may be embedded in documents. A heap buffer overflow existed when importing an EMF+ gradient brush. The number of gradient blend points was read from the file and used to compute an allocation size, but that multiplication could overflow, so a small buffer was allocated and then filled as if it were large, writing past its end. In fixed versions the blend-point count is checked against the data actually available before allocating."
}
],
"impacts": [
{
"capecId": "CAPEC-44",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-44 Overflow Binary Resource File"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "LOCAL",
"baseScore": 5.4,
"baseSeverity": "MEDIUM",
"exploitMaturity": "PROOF_OF_CONCEPT",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "PASSIVE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-787",
"description": "CWE-787 Out-of-bounds Write",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-190",
"description": "CWE-190 Integer Overflow or Wraparound",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-21T09:30:52.886Z",
"orgId": "4fe7d05b-1353-44cc-8b7a-1e416936dff2",
"shortName": "Document Fdn."
},
"references": [
{
"url": "https://www.libreoffice.org/about-us/security/advisories/cve-2026-6045"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Heap buffer overflow in EMF+ gradient brush import",
"x_generator": {
"engine": "Vulnogram 1.0.2"
}
}
},
"cveMetadata": {
"assignerOrgId": "4fe7d05b-1353-44cc-8b7a-1e416936dff2",
"assignerShortName": "Document Fdn.",
"cveId": "CVE-2026-6045",
"datePublished": "2026-06-15T16:22:16.574Z",
"dateReserved": "2026-04-09T19:07:34.963Z",
"dateUpdated": "2026-10-21T09:30:52.886Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}