Vulnerability · Published Jun 15, 2026 · Assigned by Document Fdn.
CVE-2026-8358Heap buffer overflow in spreadsheet tracked-changes import
Medium 5.4
In plain English
A medium-severity type confusion in LibreOffice from The Document Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libreoffice | 4:7.4.7-1+deb12u13 | DEBIAN-CVE-2026-8358 |
| Debian:13 | libreoffice | 4:25.2.3-2+deb13u5 | DEBIAN-CVE-2026-8358 |
| Debian:14 | libreoffice | 4:26.2.4.2-1 | DEBIAN-CVE-2026-8358 |
| Ubuntu:22.04:LTS | libreoffice | 1:7.3.7-0ubuntu0.22.04.12 | UBUNTU-CVE-2026-8358 |
| Ubuntu:22.04:LTS | libreoffice | 1:7.3.7-0ubuntu0.22.04.12 | USN-8534-1 |
| Ubuntu:24.04:LTS | libreoffice | 4:24.2.7-0ubuntu0.24.04.6 | USN-8534-1 |
| Ubuntu:24.04:LTS | libreoffice | 4:24.2.7-0ubuntu0.24.04.6 | UBUNTU-CVE-2026-8358 |
| Ubuntu:25.10 | libreoffice | no fix listed | UBUNTU-CVE-2026-8358 |
| Ubuntu:26.04:LTS | libreoffice | 4:26.2.4.2-0ubuntu0.26.04.2 | USN-8534-1 |
| Ubuntu:26.04:LTS | libreoffice | 4:26.2.4.2-0ubuntu0.26.04.2 | UBUNTU-CVE-2026-8358 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| The Document Foundation | LibreOffice | 25.8 – before < 25.8.726.2 – before < 26.2.4 |
Weakness: CWE-843, CWE-787 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P