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.

INFO

Published Date :

2026-01-22T00:17:10.159Z

Last Modified :

2026-01-22T21:44:27.284Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-23951 vulnerability.

Vendors Products
Sumatrapdfreader
  • Sumatrapdf
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-23951.

URL Resource
https://github.com/sumatrapdfreader/sumatrapdf/blob/master/src/PalmDbReader.cpp cve-icon cve-icon
https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-hj4w-c5x8-p2hv cve-icon cve-icon
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