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Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.
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 MOBI file can use an attacker-controlled header length to bypass optional-field early returns and cause the decoder to read beyond a short heap buffer. Opening the crafted document can crash SumatraPDF. This issue is fixed in version 3.6.
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{
"vendor": "sumatrapdfreader",
"product": "sumatrapdf",
"versions": [
{
"version": "< 3.6",
"status": "affected"
}
]
}Original source record · Cite this exact observation · Complete original publisher JSON