PatchSiren

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-8356 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-8356

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-8356 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-8356

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.