What’s Vulnerable › Vulnerabilities
CVE-2026-8356: Stack buffer overflow in PPT presentation import
- Severity: medium (CVSS 5.4 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-15 · updated 2026-10-25
- Weakness: CWE-121
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 products
- The Document Foundation LibreOffice: from 26.2 before < 26.2.4 — fixed in < 26.2.4
How to fix
Upgrade to a fixed version: The Document Foundation LibreOffice < 26.2.4. Check the vendor advisory for mitigations.
References
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