Vulnerability · CVE-2026-63275
Stack buffer overflow in CFF font hint handling
Published Sep 22, 2026 · catalog updated Sep 22, 2026 · The Document Foundation LibreOffice
Check if you run it
No confirmed exploitation is on record for CVE-2026-63275. EPSS is 0.19%. Act only if a listed version of The Document Foundation LibreOffice is installed.
Gaps on this record
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Medium5.4
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.19%
- Remediation
- Advisory link
- Affected products
- vendor The Document Foundation LibreOffice
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor The Document Foundation LibreOfficeversion unspecified
How to fix CVE-2026-63275
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-63275. EPSS is 0.19%. Act only if a listed version of The Document Foundation LibreOffice is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-787: Out-of-bounds Write. EPSS 0.19%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Sep 22, 2026 · CVE.org
Updated
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.
Oct 23, 2026 · BSI CERT-Bund
Detected
CVE-2026-63275 is listed by LibreOffice: Mehrere Schwachstellen.
Sources
- BSI CERT-BundGovernment advisoryCVE-2026-63275
LibreOffice: Mehrere Schwachstellen
wid.cert-bund.de - CVE.orgVulnerability recordCVE-2026-63275
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 ver
cve.org - FIRST EPSSExploitation probabilityCVE-2026-63275
30-day exploitation probability 0.19%
first.org
References
Freshness
Last verified in this catalog Oct 24, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.