CVE-2026-6047 Heap buffer overflow in OOXML text box element import
A heap buffer overflow in LibreOffice's OOXML text box import allows attackers to execute arbitrary code or cause a crash via a malicious document.
- 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-2026-6047?
CVE-2026-6047 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 can import documents in the OOXML format (DOCX). A heap buffer overflow existed when replaying deferred parser events for a text box element. A handler object was assumed to be of one type and written to at that type's field layout, but it could be a smaller object, so the write landed past the end of the allocation. In fixed versions the type is checked before the write.
Which versions are affected by CVE-2026-6047?
How do I fix CVE-2026-6047?
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-2026-6047 being exploited?
There is no known exploitation of CVE-2026-6047 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-6047, GHSA-wq72-h3fh-w757, UBUNTU-CVE-2026-6047.