Libxls Project: >> Libxls >> 1.6.3 Security Vulnerabilities
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.
CVSS Score
5.3
EPSS Score
0.002
Published
2026-06-03