Quick answers
- Is CVE-2026-63273 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-63273 being exploited in the wild.
- How severe is CVE-2026-63273?
- Informational severity, published 22 September 2026.
- Which products and versions are affected?
- LibreOffice Draw before 26.2.5.
- Is there a fix for CVE-2026-63273?
- A patch was published on 2026-09-21: Fixed in LibreOffice 26.2.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-63273 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-63273?
- Check whether you run LibreOffice Draw at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a classic heap buffer overflow in PDF import encryption handling due to insufficient bounds checking on the decryption key length. The key length is extracted from the document's encryption dictionary and used to fill a fixed-size buffer without validation, allowing writes beyond the buffer boundary. This requires user interaction (opening a document) and network delivery, but no authentication; the flaw was fixed in version 26.2.5 by rejecting declared key lengths that exceed the buffer size.
Affected products
- LibreOffice Draw before 26.2.5
Timeline
- 2026-09-21: disclosed
- 2026-09-21: patched: Fixed in LibreOffice 26.2.5