CVE-2026-63275
published 2026-09-22CVE-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…
PriorityP424medium5.4CVSS 4.0
AVLACLATNPRNUIPVCLVILVAHSCNSINSANEPCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.19%
7.8th percentile
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.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| libreoffice | libreoffice | — | — |
| the_document_foundation | libreoffice | >= 26.2 < < 26.2.5 | < 26.2.5 |
| ubuntu | libreoffice | — | — |
CVSS provenance
nvdv4.05.4MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_ubuntu7.3HIGH
vendor_redhat5.4MEDIUM
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Ubuntu
LibreOffice vulnerabilities
vendor_ubuntu·2026-10-05·CVSS 7.3
CVE-2026-50593 [HIGH] LibreOffice vulnerabilities
Title: LibreOffice vulnerabilities
Summary: Several security issues were fixed in LibreOffice.
It was discovered that LibreOffice incorrectly handled WMF image
imports. An attacker could possibly use this issue to cause LibreOffice
to crash, resulting in a denial of service, or execute arbitrary code.
(CVE-2026-63272)
It was discovered that LibreOffice incorrectly handled PDF document
imports. An attacker could possibly use this issue to cause LibreOffice
to crash, resulting in a denial of service, or execute arbitrary code.
(CVE-2026-63273, CVE-2026-63274)
It was discovered that LibreOffice incorrectly handled CFF fonts
embedded in documents. An attacker could possibly use this issue to
cause LibreOffice to crash, resulting in a denial of service, or
execute arbitrary code. (CVE-2026-
Red Hat
libreoffice: stack buffer overflow in CFF font hint handling
vendor_redhat·2026-09-22·CVSS 5.4
CVE-2026-63275 [MEDIUM] CWE-121 libreoffice: stack buffer overflow in CFF font hint handling
libreoffice: stack buffer overflow in CFF font hint handling
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.
A flaw was found in LibreOffice. When a user opens a specially crafted document containing embedded CFF fonts, a stack-based buffer overflow can occur when reading the hints of a glyph due to improper bounds checking. This issue can cause memory corruption, resulting in an application crash.
Statement: To exploit this issue, an attacker needs to convince a user to open a special
GHSA
LibreOffice can read CFF fonts, which may be embedded in documents.
ghsa_unreviewed·2026-09-22
CVE-2026-63275 [MEDIUM] CWE-787 LibreOffice can read CFF fonts, which may be embedded in documents.
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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-63275 libreoffice: stack buffer overflow in CFF font hint handling [fedora-all]
bugzilla·2026-09-24·CVSS 5.4
CVE-2026-63275 [MEDIUM] CVE-2026-63275 libreoffice: stack buffer overflow in CFF font hint handling [fedora-all]
CVE-2026-63275 libreoffice: stack buffer overflow in CFF font hint handling [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-63275 libreoffice: stack buffer overflow in CFF font hint handling
bugzilla·2026-09-22·CVSS 5.4
CVE-2026-63275 [MEDIUM] CVE-2026-63275 libreoffice: stack buffer overflow in CFF font hint handling
CVE-2026-63275 libreoffice: stack buffer overflow in CFF font hint handling
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.
2026-09-22
Published