CVE-2026-6040

A heap use-after-free existed when importing the blank-width characters of an ODF number format. A position value read from the document was not checked against the length of the format-code string, so a malformed number format could be processed against memory outside that string. In fixed versions the position is bounds-checked before use.

CVSS v3 7.3 HIGH

7.3^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.3 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://www.libreoffice.org/about-us/security/advisories/cve-2026-6040
https://access.redhat.com/security/cve/CVE-2026-6040
https://bugzilla.redhat.com/show_bug.cgi?id=2488966
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6040.json

Configurations

No configuration.

History

25 Oct 2026, 23:10

Type	Values Removed	Values Added
Summary		(es) Existía un uso después de liberación en el heap al importar los caracteres de ancho en blanco de un formato de número ODF. Un valor de posición leído del documento no se comprobaba con respecto a la longitud de la cadena de código de formato, por lo que un formato de número malformado podría procesarse contra memoria fuera de esa cadena. En las versiones corregidas, la posición se comprueba en los límites antes de su uso.

Information

Published : 2026-06-15 18:16

Updated : 2026-10-25 23:10

NVD link : CVE-2026-6040

Mitre link : CVE-2026-6040

CVE.ORG link : CVE-2026-6040

JSON object : View

Products Affected

No product.

CWE

CWE-416

Use After Free

CWE-787

Out-of-bounds Write

CWE-825

Expired Pointer Dereference

{"id": "CVE-2026-6040", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-6040", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-15T18:14:24.996356Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.3, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.3}], "cvssMetricV40": [{"type": "Secondary", "source": "security@documentfoundation.org", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 5.4, "Automatable": "NOT_DEFINED", "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "PROOF_OF_CONCEPT", "providerUrgency": "NOT_DEFINED", "userInteraction": "PASSIVE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security@documentfoundation.org", "affectedData": [{"vendor": "The Document Foundation", "product": "LibreOffice", "versions": [{"status": "affected", "version": "25.8", "lessThan": "< 25.8.7", "versionType": "25.8 series"}, {"status": "affected", "version": "26.2", "lessThan": "< 26.2.3", "versionType": "26.2 series"}], "defaultStatus": "unknown"}]}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "affectedData": [{"cpes": ["cpe:/o:redhat:enterprise_linux:6"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "packageName": "libreoffice", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unknown"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:7"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "packageName": "libreoffice", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:8"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "packageName": "libreoffice", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:9"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "packageName": "libreoffice", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}]}], "published": "2026-06-15T18:16:36.880", "references": [{"url": "https://www.libreoffice.org/about-us/security/advisories/cve-2026-6040", "source": "security@documentfoundation.org"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-6040", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2488966", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6040.json", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security@documentfoundation.org", "description": [{"lang": "en", "value": "CWE-416"}, {"lang": "en", "value": "CWE-787"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-825"}]}], "descriptions": [{"lang": "en", "value": "A heap use-after-free existed when importing the blank-width characters of an ODF number format. A position value read from the document was not checked against the length of the format-code string, so a malformed number format could be processed against memory outside that string. In fixed versions the position is bounds-checked before use."}, {"lang": "es", "value": "Exist\u00eda un uso despu\u00e9s de liberaci\u00f3n en el heap al importar los caracteres de ancho en blanco de un formato de n\u00famero ODF. Un valor de posici\u00f3n le\u00eddo del documento no se comprobaba con respecto a la longitud de la cadena de c\u00f3digo de formato, por lo que un formato de n\u00famero malformado podr\u00eda procesarse contra memoria fuera de esa cadena. En las versiones corregidas, la posici\u00f3n se comprueba en los l\u00edmites antes de su uso."}], "lastModified": "2026-10-25T23:10:00.167", "sourceIdentifier": "security@documentfoundation.org"}