A heap-buffer-overflow and use-after-free vulnerability exists in the xls_getCSS() function of libxls 1.6.3 due to insufficient validation of a file-controlled font index.

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History

Tue, 15 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 11 Sep 2026 13:15:00 +0000

Type Values Removed Values Added
First Time appeared Libxls
Libxls libxls
Vendors & Products Libxls
Libxls libxls

Thu, 10 Sep 2026 23:00:00 +0000

Type Values Removed Values Added
Title Heap Buffer Overflow and Use‑After‑Free in libxls xls_getCSS Function
Weaknesses CWE-122
CWE-416

Thu, 10 Sep 2026 20:45:00 +0000

Type Values Removed Values Added
Description A heap-buffer-overflow and use-after-free vulnerability exists in the xls_getCSS() function of libxls 1.6.3 due to insufficient validation of a file-controlled font index.
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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-15T14:11:05.734Z

Reserved: 2026-08-25T00:00:00.000Z

Link: CVE-2026-79591

cve-icon Vulnrichment

Updated: 2026-09-15T14:09:46.670Z

cve-icon NVD

Status : Received

Published: 2026-09-10T21:17:46.933

Modified: 2026-09-15T15:17:22.207

Link: CVE-2026-79591

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-11T13:00:14Z

Weaknesses