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    CVE-2026-63274

    LibreOffice Draw can import PDF documents. A heap buffer overflow existed when importing a stream object. The length of the stream was taken from the object's own dictionary and was not checked against the number of bytes actually present, so copying the stream read and wrote past the end of the buffer holding it. In fixed versions the declared length is clamped to the bytes actually read.

    Published:Sep 22, 2026
    Last Modified:Sep 22, 2026
    EPS:Sep 22, 2026
    EPSS Score:
    CVSS Score:5.4

    Affected Products

    Vendor
    The Document Foundation
    Product
    Libreoffice

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

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    CVE-2026-63268 (CVSS 6.7) — LibreOffice Calc can link a cell range to an external data source, and the link is saved in the document. A li…
    CVE-2026-63266 (CVSS 6.8) — LibreOffice Calc can link a cell range to an external data source, and the link is saved in the document. Thro…
    CVE-2026-63277 (CVSS 8.5) — LibreOffice Calc can link a cell range to an external data source, and the link is saved in the document. A do…
    CVE-2026-63279 (CVSS 5.4) — LibreOffice can import PICT images, which may be embedded in documents. An out of bounds read existed when imp…
    CVE-2026-63278 (CVSS 6.7) — URLs could be constructed which expanded environment variable or INI file values, so potentially sensitive inf…
    CVE-2026-63276 (CVSS 5.4) — LibreOffice converts CFF fonts to Type 1 when it subsets a font, which happens when a document is exported to …
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High