CVE-2025-48172

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CVSS 3.1

5.6 medium

EPSS

<1%p6

Published

Jul 4, 2025 (Jul 4, 2025)

Modified

Jun 17, 2026

Description

CHMLib through 2bef8d0, as used in SumatraPDF and other products, has a chm_lib.c _chm_decompress_block integer overflow. There is a resultant heap-based buffer overflow in _chm_fetch_bytes.

Weakness: CWE-190
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L

NVD CVE.org GitHub PoCs EPSS (0.2%)

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