CVE-2026-8356

Stack buffer overflow in PPT presentation import

MEDIUM

5.4

CVSS Score

Published: June 15, 2026 at 04:23 PM UTC

Updated: October 25, 2026 at 11:10 PM UTC

1 product affected across 1 vendorLibreOffice

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Severity

MEDIUM5.4

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

LibreOffice can import presentations in the legacy binary PPT format. A stack buffer overflow existed when importing a colour-replacement record. Two fixed-size colour tables were filled from the file, but the write position was not reset between the two passes over the record, so a file whose combined colour counts exceeded the table size wrote past the end of the tables on the stack. In fixed versions the unused second pass is no longer read into those tables.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

LibreOffice · Document

90%

26.2 ≤ v < < 26.2.426.2

Affected range stops below < 26.2.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord

https://www.libreoffice.org/about-us/security/advisories/cve-2026-8356

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUMDocument Fdn.

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-787CWE-121

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