CVE-2026-26825

Libxls 1.6.3 contains a use-of-uninitialized memory vulnerability when parsing malformed XLS files. The issue is triggered by uninitialized heap memory originating from the OLE layer (ole2_read) and is reachable via xls_parseWorkBook(). MemorySanitizer can detect it; the advisory notes undefined ...

CVE-2026-26824

CVE-2026-26824 affects libxls up to version 1.6.3, where the MSAT (Master Sector Allocation Table) memory allocated during read_MSAT() is not fully initialized before use by ole2_validate_sector_chain() in the OLE container parser. This use-of-uninitialized-memory can cause application crashes or...