Stack-based Buffer Overflow Affecting libreoffice-core package, versions <1:7.1.8.1-15.el9_8.3


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.19% (8th percentile)

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  • Snyk IDSNYK-RHEL9-LIBREOFFICECORE-20880779
  • published13 Oct 2026
  • disclosed22 Sept 2026

Introduced: 22 Sep 2026

NewCVE-2026-63276  (opens in a new tab)
CWE-121  (opens in a new tab)

How to fix?

Upgrade RHEL:9 libreoffice-core to version 1:7.1.8.1-15.el9_8.3 or higher.
This issue was patched in RHSA-2026:82013.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libreoffice-core package and not the libreoffice-core package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

LibreOffice converts CFF fonts to Type 1 when it subsets a font, which happens when a document is exported to PDF, and CFF fonts may be embedded in documents. A stack buffer overflow existed in that conversion. The converted operators were written into a fixed size buffer with no check that they still fit, so a glyph emitting many operators wrote past the end of the buffer. In fixed versions the remaining capacity is tracked and the conversion stops when it is used up.

CVSS Base Scores

version 3.1