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PatchSiren cyber security CVE debrief

CVE-2026-8358 The Document Foundation CVE debrief

CVE-2026-8358 is a medium-severity vulnerability in LibreOffice Calc that can lead to a heap buffer overflow when importing tracked changes from a spreadsheet. The vulnerability occurs when a document reuses the same change identifier for two different kinds of change, causing the importer to treat one change object as a different, larger type and write past the end of its allocation. In fixed versions, records with a duplicate identifier are rejected.

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 Calc, particularly those who import tracked changes from spreadsheet documents, should be aware of this vulnerability and ensure they are using a fixed version.

Technical summary

The vulnerability is caused by a heap buffer overflow in the LibreOffice Calc importer. When a document reuses the same change identifier for two different kinds of change, the importer incorrectly treats one change object as a different, larger type and writes past the end of its allocation.

Defensive priority

Medium

Recommended defensive actions

  • Update to a fixed version of LibreOffice Calc
  • Be cautious when importing tracked changes from spreadsheet documents

Evidence notes

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

Sources and references

Verified primary and authoritative sources

  • CVE-2026-8358 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-8358

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

  • CVE-2026-8358 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-8358

    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.