CVSS 3.1
5.5 mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HCVE-2026-23951
Medium (5.5) in sumatrapdfreader sumatrapdf. EPSS 0.2% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 12% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-193, CWE-125, CWE-191
- Published
- Modified
- Record from
- the NVD, synced
Affected
- sumatrapdfreader:sumatrapdf