PatchSiren cyber security CVE debrief

CVE-2026-8356 The Document Foundation CVE debrief

CVE-2026-8356 is a stack buffer overflow vulnerability in LibreOffice's PPT import feature. When importing a colour-replacement record from a PPT file, two fixed-size colour tables are filled from the file. However, the write position was not reset between the two passes over the record. This could allow a file with a combined colour count exceeding the table size to write past the end of the tables on the stack. The vulnerability has been fixed by removing the unused second pass over the record.

Vendor: The Document Foundation
Product: LibreOffice
CVSS: MEDIUM 5.4
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-06-15
Original CVE updated: 2026-06-15
Advisory published: 2026-06-15
Advisory updated: 2026-06-15

Who should care

Users of LibreOffice who open PPT files from untrusted sources should update to the latest version.

Technical summary

The vulnerability exists in the PPT import feature of LibreOffice. A stack buffer overflow occurs when importing a colour-replacement record from a PPT file. The vulnerability has a CVSS score of 5.4 and is classified as MEDIUM severity.

Defensive priority

Medium

Recommended defensive actions

Update to the latest version of LibreOffice.

Evidence notes

The CVE record was obtained from the official CVE website and the NVD database.

Official resources

CVE-2026-8356 was published on 2026-06-15T18:16:37.390Z and has not been modified since then.