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ZDI-26-783: LibreOffice PDF File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability

The Document Foundation LibreOffice · CVE-2026-63273 ZDI-26-783
0 news outlets0 CERTs and agencies0 researchers

What is it?

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.

Evidence

Research (1)

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
5.4
EPSS
0.1%
First seen
6 d ago
Status
confirmed

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