CVE-2026-63278 Package URLs can be used to exfiltrate arbitrary INI file values and environment variables
Attackers can exfiltrate sensitive environment variables and INI file values by tricking users into opening documents with malicious package URLs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-63278?
CVE-2026-63278 is a medium-severity vulnerability in The Document Foundation LibreOffice, published on 22 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
URLs could be constructed which expanded environment variable or INI file values, so potentially sensitive information could be exfiltrated to a remote server on opening a document containing such links. The check added for CVE-2024-12426 did not recognise every way of naming the package content provider, so a URL that named it differently still reached the expansion. In fixed versions the package content provider is matched when the URL is checked.
Weakness: CWE-200
Which versions are affected by CVE-2026-63278?
How do I fix CVE-2026-63278?
Apply the vendor's patch.
Is CVE-2026-63278 being exploited?
There is no known exploitation of CVE-2026-63278 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-63278, ECHO-0e64-158a-542b, GHSA-74rr-xj7r-w3qp, MINI-99xm-fh86-f67m, UBUNTU-CVE-2026-63278.