CVE-2026-8358

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{"bugzilla": {"description": "LibreOffice: LibreOffice Calc: Heap buffer overflow leads to denial of service via crafted spreadsheet document.", "id": "2488959", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2488959"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["LibreOffice Calc can import tracked changes from a spreadsheet document. A heap buffer overflow existed when a document reused the same change identifier for two different kinds of change. The importer then treated one change object as a different, larger type and wrote past the end of its allocation. In fixed versions records with a duplicate identifier are rejected.", "A heap-based buffer overflow vulnerability was discovered in LibreOffice Calc's spreadsheet importer. When processing tracked changes from a spreadsheet document, the application fails to properly handle duplicate change identifiers. By reusing the same change identifier for two distinct types of change objects, a maliciously crafted document can trick the importer into treating a change object as a different, larger data type than originally allocated. This mismatch causes the importer to write data past the boundaries of the allocated heap buffer, which could result in a denial of service (application crash) or limited impacts to confidentiality and integrity under the privileges of the current user."], "mitigation": {"lang": "en:us", "value": "Red Hat is not aware of a practical temporary workaround that fully mitigates this issue or meets Red Hat Product Security's standards for usability, deployment, applicability, or stability."}, "name": "CVE-2026-8358", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "libreoffice", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "libreoffice", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "libreoffice", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "libreoffice", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-15T16:24:03Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-8358\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-8358\nhttps://www.libreoffice.org/about-us/security/advisories/cve-2026-8358"], "statement": "This vulnerability affects LibreOffice Calc's tracked-changes import functionality. Red Hat Product Security has assessed this issue as a Moderate severity vulnerability.\nThe flaw occurs when importing spreadsheet documents containing tracked-change records that reuse the same change identifier for different change types. Under these conditions, the importer may incorrectly treat a change object as a different, larger object type and write beyond the bounds of the allocated heap buffer.\nSuccessful exploitation requires a user to open a specially crafted spreadsheet document. A remote attacker could leverage this issue to cause application crashes resulting in denial of service and potentially achieve limited disclosure or modification of data within the context of the affected application.", "threat_severity": "Moderate"}

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