Vulnerability · Published Sep 22, 2026 · Assigned by Document Fdn.
CVE-2026-63278Package URLs can be used to exfiltrate arbitrary INI file values and environment variables
Medium 6.7
In plain English
A medium-severity information exposure in LibreOffice from The Document Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libreoffice | no fix listed | DEBIAN-CVE-2026-63278 |
| Debian:13 | libreoffice | 4:25.2.3-2+deb13u7 | DEBIAN-CVE-2026-63278 |
| Debian:14 | libreoffice | 4:26.2.5.2-1 | DEBIAN-CVE-2026-63278 |
| Ubuntu:22.04:LTS | libreoffice | 1:7.3.7-0ubuntu0.22.04.13 | UBUNTU-CVE-2026-63278 |
| Ubuntu:22.04:LTS | libreoffice | 1:7.3.7-0ubuntu0.22.04.13 | USN-8868-1 |
| Ubuntu:24.04:LTS | libreoffice | 4:24.2.7-0ubuntu0.24.04.7 | USN-8868-1 |
| Ubuntu:24.04:LTS | libreoffice | 4:24.2.7-0ubuntu0.24.04.7 | UBUNTU-CVE-2026-63278 |
| Ubuntu:26.04:LTS | libreoffice | 4:26.2.6.3-0ubuntu0.26.04.2 | USN-8868-1 |
| Ubuntu:26.04:LTS | libreoffice | 4:26.2.6.3-0ubuntu0.26.04.2 | UBUNTU-CVE-2026-63278 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| The Document Foundation | LibreOffice | 26.2 – before < 26.2.5 |
Weakness: CWE-200 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N