CVE-2026-23951 | THREATINT

Description

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.

PUBLISHED Reserved 2026-01-19 | Published 2026-01-22 | Updated 2026-01-22 | Assigner GitHub_M

MEDIUM: 5.5CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Problem types

CWE-125: Out-of-bounds Read

CWE-191: Integer Underflow (Wrap or Wraparound)

Product status

<= 3.5.2rel

affected

References

github.com/...trapdf/security/advisories/GHSA-hj4w-c5x8-p2hv

github.com/...er/sumatrapdf/blob/master/src/PalmDbReader.cpp

cve.org (CVE-2026-23951)

nvd.nist.gov (CVE-2026-23951)

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