CVE-2026-25920

MEDIUM
2026-02-09 [email protected]
5.5
CVSS 3.1
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CVSS 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

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Feb 20, 2026 - 20:22 vuln.today
Public exploit code
CVE Published
Feb 09, 2026 - 22:16 nvd
MEDIUM 5.5

Tags

Windows Denial Of Service Sumatrapdf

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.

Analysis

SumatraPDF versions 3.5.2 and earlier are vulnerable to a heap buffer over-read in the MOBI file parser due to incomplete bounds validation in the HuffDic decompressor, allowing attackers to crash the application by opening a malicious .mobi file. Public exploit code exists for this vulnerability. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

48
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +28
POC: +20

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CVE-2026-25920 vulnerability details – vuln.today
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