CVE-2025-48172

MEDIUM

CHMLib < 2bef8d06 - Heap-Based Buffer Overflow via Integer Overflow

Title source: llm
STIX 2.1

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.

References (4)

Core 4

Scores

CVSS v3 5.6
EPSS 0.0015
EPSS Percentile 4.9%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-190
Status published
Products (1)
CHMLib/CHMLib < 2bef8d063ec7d88a8de6fd9f0513ea42ac0fa21f
Published Jul 04, 2025
Tracked Since Feb 18, 2026