CVE-2026-26824

Published Jun 3, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Libxls
Libxls libxls
Vendors & Products Libxls
Libxls libxls
Type Values Removed Values Added
First Time appeared Libxls Project
Libxls Project libxls
CPEs cpe:2.3:a:libxls_project:libxls:*:*:*:*:*:*:*:*
Vendors & Products Libxls Project
Libxls Project libxls
Type Values Removed Values Added
Title Uninitialized Memory Use in libxls OLE Parser Leading to Crash or Information Disclosure
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Uninitialized Memory Use in libxls OLE Parser Leading to Crash or Information Disclosure
Weaknesses CWE-457
Type Values Removed Values Added
Description libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Sep 23, 2026, 3:47 PM
Reserved
Feb 16, 2026, 12:00 AM
Status
Modified
Published
Jun 3, 2026, 8:16 PM
Modified
Sep 23, 2026, 4:16 PM