LibreOffice up to 25.8.6/26.2.2 out-of-bounds write

Summaryinfo

A vulnerability identified as critical has been detected in LibreOffice up to 25.8.6/26.2.2. This affects an unknown function. This manipulation causes out-of-bounds write. The identification of this vulnerability is CVE-2026-6047. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in LibreOffice up to 25.8.6/26.2.2 and classified as critical. Affected by this vulnerability is some unknown functionality. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at libreoffice.org. This vulnerability is known as CVE-2026-6047 since 04/09/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 321146 (Linux Distros Unpatched Vulnerability : CVE-2026-6047), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 25.8.7 or 26.2.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (321146). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Office Suite Software

Name

• LibreOffice

Version

• 25.8.0
• 25.8.1
• 25.8.2
• 25.8.3
• 25.8.4
• 25.8.5
• 25.8.6
• 26.2.0
• 26.2.1
• 26.2.2

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion