CVE-2026-4430: Out-of-bounds write vulnerability in The Document Foundation LibreOffice via crafted OOXML documents with mismatched…

CVE-2026-4430 · Severity: high · CVSS 7.8 · Published 2026-05-07

Out-of-bounds write vulnerability in The Document Foundation LibreOffice via crafted OOXML documents with mismatched encryption salt parameters.

This issue affects LibreOffice: from 26.2 before 26.2.3, from 25.8 before 25.8.7.

Technologies: LibreOffice. Vendors: LibreOffice.

Quick answers

Is CVE-2026-4430 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-4430 being exploited in the wild.
How severe is CVE-2026-4430?
High severity, with a CVSS score of 7.8, published 7 May 2026.
Which products and versions are affected?
LibreOffice. The advisory does not name versions.
Is there a fix for CVE-2026-4430?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-4430?
Check whether you run LibreOffice. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • LibreOffice

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