CVE-2026-26825
Medium · 5.3CVSS
5.3
EPSS
0.4%
Published
Jun 3, 2026
CISA due date
—
The record
A use-of-uninitialized memory vulnerability exists in libxls 1.6.3 when parsing malformed XLS files. The issue is reachable via xls_parseWorkBook() and is triggered by uninitialized heap memory originating from the OLE layer (ole2_read). The flaw is detectable with MemorySanitizer (MSAN) and can lead to undefined behavior, incorrect parsing logic, or potential information disclosure.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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