CVE-2026-26054: CWE-125: Out-of-bounds Read in sumatrapdfreader sumatrapdf
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.
CVE-2026-26054: CWE-125: Out-of-bounds Read in sumatrapdfreader sumatrapdf
Description
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.
CVSS v4.0
Score 6.8medium
Affected software
sumatrapdfreader
sumatrapdf
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-02-10T18:01:31.899Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab557d2f7a7c5410694c2d0
Added to database: 09/24/2026, 17:03:14 UTC
Last updated: 09/24/2026, 17:03:14 UTC
Views: 1
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