medium5.5
CVE-2026-23951
SumatraPDF is a multi-format reader for Windows.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Sumatrapdfreader | Sumatrapdf | All versions |