CVE-2026-63273 Details
Description
LibreOffice Draw can import PDF documents. A heap buffer overflow existed when importing an encrypted document. The length of the decryption key was taken from the document's own encryption dictionary and was used to fill a fixed size key buffer without being checked against it, so a length larger than that buffer wrote past its end. In fixed versions a declared key length larger than the buffer is rejected.
A heap buffer overflow vulnerability has been identified in LibreOffice Draw versions prior to 26.2.5, when importing encrypted PDF documents. The vulnerability arises because the length of the decryption key is taken from the document's encryption dictionary and used to fill a fixed-size key buffer without proper validation. This oversight allows a key length larger than the buffer to write past its allocated end, potentially leading to memory corruption. In versions 26.2.5 and later, such oversized key lengths are rejected, mitigating the issue.
Users are advised to upgrade to LibreOffice version 26.2.5 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 22, 2026CISA-ADP
Assessed Sep 22, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.libreoffice.org/about-us/security/advisories/cve-2026-63273 | [email protected] | AdvisoryBundleRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-787 | Out-of-bounds Write | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| LibreOffice | All versions |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 22, 2026 | CVE Modified | CISA-ADP |
| Sep 22, 2026 | New CVE Received | [email protected] |