CVE-2026-26054
SumatraPDF: Heap out-of-bounds read in MOBI header parser.
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-125 |
| Vendor | sumatrapdfreader |
| Product | sumatrapdf |
| Published | Sep 24, 2026 |
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Affected Versions
sumatrapdfreader / sumatrapdf
< 3.6
References
github.com: https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-27p6-wrfp-pgm8 github.com: https://github.com/sumatrapdfreader/sumatrapdf/issues/5318 github.com: https://github.com/sumatrapdfreader/sumatrapdf/commit/24b9ce83383bbaa48b3efe00e4d30cccea126198 github.com: https://github.com/sumatrapdfreader/sumatrapdf/releases/tag/3.6rel