Medium severity5.6OSV Advisory· Published Jul 4, 2025· Updated Apr 15, 2026
CVE-2025-48172
CVE-2025-48172
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- Range: 1.4split, 1.5split, 1.6split, …
Patches
Vulnerability mechanics
References
4- drive.google.com/file/d/1XpulFyCGlq7Szzg5RsH-eRwZ6OyuSozl/viewnvd
- drive.google.com/file/d/1wq51px42eoJz2VQ1Qu9ObPVQVom9T9H_/viewnvd
- github.com/jedwing/CHMLib/blob/2bef8d063ec7d88a8de6fd9f0513ea42ac0fa21f/src/chm_lib.cnvd
- github.com/sumatrapdfreader/sumatrapdf/commit/08179946a745cf1605e4b9670942ec1a6e1f4c5dnvd
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