CVE-2026-26825

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.

• CWE-908
• CWE-908

• https://github.com/libxls/libxls/issues/156Exploit, Issue Tracking

Published

Jun 3, 2026

Last Modified

Jul 22, 2026

Status

Modified

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