CVE-2026-8358 Heap buffer overflow in spreadsheet tracked-changes import
Heap buffer overflow in LibreOffice Calc allows attackers to execute arbitrary code or cause denial of service via a crafted spreadsheet with duplicate change identifiers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-8358?
CVE-2026-8358 is a medium-severity memory corruption vulnerability in The Document Foundation LibreOffice, published on 15 Jun 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
LibreOffice Calc can import tracked changes from a spreadsheet document. A heap buffer overflow existed when a document reused the same change identifier for two different kinds of change. The importer then treated one change object as a different, larger type and wrote past the end of its allocation. In fixed versions records with a duplicate identifier are rejected.
Which versions are affected by CVE-2026-8358?
How do I fix CVE-2026-8358?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-8358 being exploited?
There is no known exploitation of CVE-2026-8358 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-8358, GHSA-gpc5-jgqj-xp2q, UBUNTU-CVE-2026-8358.