Heap buffer overflow in PDF import encryption handling
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| The Document Foundation | LibreOffice | 26.2 to before < 26.2.5 | < 26.2.5 | Patch available | CNA |
- LibreOffice VendorThe Document Foundation Affected 26.2 to before < 26.2.5 Fixed in < 26.2.5 Patch available CNA
Remediation
- Fix · CNA LibreOffice (The Document Foundation) Fixed in < 26.2.5
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
The Document Foundation LibreOffice < 26.2.5
7 records Highest priority Priority LOW 7 LOW
Other records, highest priority first
- TI-2026-45134 Package URLs can be used to exfiltrate arbitrary INI file values and environment variablesPriority LOW 29
- TI-2026-45133 Stack buffer overflow in CFF to Type 1 font conversionPriority LOW 24
- TI-2026-45132 Stack buffer overflow in CFF font hint handlingPriority LOW 24
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-63273
- 2026-10-03 Alias added: GHSA-254q-47m3-r67w
More The Document Foundation vulnerabilities
- TI-2019-07233 LibreLogo global-event script execution CVSS 3.1CRITICAL 9.8
- TI-2018-12068 Path traversal in [UNKNOWN] libreoffice CVSS 3.0CRITICAL 9.8
- TI-2018-07474 An information disclosure vulnerability occurs when LibreOffice 6.0.3 and Apache… CVSS 3.0HIGH 7.5
- TI-2019-07230 Code injection in Document Foundation LibreOffice CVSS 3.1CRITICAL 9.8
- TI-2018-05018 LibreOffice before 5.4.5 and 6.x before 6.0.1 allows remote attackers to read arbitrary… CVSS 3.0CRITICAL 9.8
- TI-2023-01118 Arbitrary file write in libreoffice CVSS 3.1MEDIUM 5.5
Sources
- CVE-2026-63273 · CVE Program
- CVE-2026-63273 · NVD
- FIRST EPSS
- GHSA-254q-47m3-r67w · GitHub Advisory Database · CC BY 4.0
- CVE-2026-63273 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences