CVE-2026-23951
SumatraPDF's Integer Underflow in PalmDbReader Leads to Crash
Summary
SumatraPDF's Integer Underflow in PalmDbReader Leads to Crash
Original description
The description as published by the source.
SumatraPDF is a multi-format reader for Windows. All versions contain an off-by-one error in the validation code that only triggers with exactly 2 records, causing an integer underflow in the size calculation. This bug exists in PalmDbReader::GetRecord when opening a crafted Mobi file, resulting in an out-of-bounds heap read that crashes the app. There are no published fixes at the time of publication.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- web github.com