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CVE-2026-23951

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CVE-2026-23951

Published: Jan 22, 2026

Modified: Jan 22, 2026

PUBLISHED

CVSS v3.1

5.5

MEDIUM

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.

VendorProductVersions

sumatrapdfreader

sumatrapdf

affected
<= 3.5.2rel

Weaknesses (CWE)

CWE-125
CWE-191

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

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