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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The Document Foundation | LibreOffice | 25.8 – < < 25.8.7, 26.2 – < < 26.2.3 | < 25.8.7 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libreoffice | 4:26.2.3.2-2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | libreoffice | 4:26.2.4.2-0ubuntu0.26.04.2 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libreoffice | 26.2.5.1-150500.20.37.1 | SUSE-SU-2026:3140-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | libreoffice | 26.8.1.1-bp160.1.1 | openSUSE-SU-2026:22216-1 |
Advisories 3
- openSUSE-SU-2026:22216-1 Security update for libreoffice SUSE / openSUSE Security Updates · Nov 4, 2026
- WID-SEC-2026-1929 LibreOffice: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Nov 3, 2026
- SUSE-SU-2026:3140-1 Security update for libreoffice SUSE / openSUSE Security Updates · Jul 21, 2026