5.4

CVE-2026-63275: the document foundation libreoffice Out-of-bounds Write

CVSS: 5.4v4.0MediumDeferred
AliasesUBUNTU-CVE-2026-63275DEBIAN-CVE-2026-63275
Published 22-09-2026Last modified 22-09-2026
Open JSON

Vulnerability summary

CVE-2026-63275 is a medium (CVSS 5.4) Out-of-bounds Write vulnerability in the document foundation libreoffice. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 7.7% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.19%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 1
MGASA-2026-0514RHSA-2026:82013USN-8868-1

Timeline

  1. 22-09-2026
    PublishedVulnerability first disclosed.
  2. 22-09-2026
    Last modifiedVulnerability information updated.

Description

LibreOffice can read CFF fonts, which may be embedded in documents. A stack buffer overflow existed when reading the hints of a glyph. The number of hints was checked against the wrong bound, so a glyph declaring more hints than the array can hold wrote past its end. In fixed versions the hint count is checked against the capacity the array really has.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

23-09-202619-10-2026
EPSS score
0.19%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • libreofficeAll versions (No fix recorded) | < 4:25.2.3-2+deb13u7 | < 4:26.2.5.2-1
The document foundation1 product
Ubuntu1 product
  • libreofficeAll versions (No fix recorded) | < 1:7.3.7-0ubuntu0.22.04.13 | < 4:24.2.7-0ubuntu0.24.04.7 | < 4:26.2.6.3-0ubuntu0.26.04.2

3 vendors · 3 products

References

6 links