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CVE-2026-25920

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CVE-2026-25920

Published: Feb 9, 2026

Modified: Feb 11, 2026

PUBLISHED

CVSS v3.1

5.5

MEDIUM

Description

SumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, a heap out-of-bounds read vulnerability exists in SumatraPDF's MOBI HuffDic decompressor. The bounds check in AddCdicData() only validates half the range that DecodeOne() actually accesses. Opening a crafted .mobi file can read nearly (1 << codeLength) bytes beyond the CDIC dictionary buffer, leading to a crash.

VendorProductVersions

sumatrapdfreader

sumatrapdf

affected
<= 3.5.2

Weaknesses (CWE)

CWE-125

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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