CVE-2026-26054

SumatraPDF, a multi-format reader for Windows, is vulnerable to a heap out-of-bounds read in the MobiDoc::ParseHeader function within src/MobiDoc.cpp. The issue occurs because DecodeMobiDocHeader constructs a decoder sized for kMobiHeaderLen without verifying the actual remaining buffer length, e...

CVE-2026-26054 SumatraPDF: Heap out-of-bounds read in MOBI header parser.

SumatraPDF is a multi-format reader for Windows. Prior to 3.6, the MobiDoc::ParseHeader function in src/MobiDoc.cpp validates a record using kMobiHeaderMinLen but DecodeMobiDocHeader constructs a decoder sized for kMobiHeaderLen without receiving the actual remaining buffer length. A malformed MO...