Vulnerability Monitor

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CVE-2025-48172

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.

Published

2025-07-04T13:15:25.453

Last Modified

2025-07-08T16:18:53.607

Status

Awaiting Analysis

Source

[email protected]

Severity

CVSSv3.1: 5.6 (MEDIUM)

Weaknesses

Type: Secondary
CWE-190

Affected Vendors & Products

References

https://drive.google.com/file/d/1XpulFyCGlq7Szzg5RsH-eRwZ6OyuSozl/view?usp=sharing ([email protected])
https://drive.google.com/file/d/1wq51px42eoJz2VQ1Qu9ObPVQVom9T9H_/view?usp=sharing ([email protected])
https://github.com/jedwing/CHMLib/blob/2bef8d063ec7d88a8de6fd9f0513ea42ac0fa21f/src/chm_lib.c#L1386 ([email protected])
https://github.com/sumatrapdfreader/sumatrapdf/commit/08179946a745cf1605e4b9670942ec1a6e1f4c5d ([email protected])
https://drive.google.com/file/d/1XpulFyCGlq7Szzg5RsH-eRwZ6OyuSozl/view?usp=sharing (134c704f-9b21-4f2e-91b3-4a467353bcc0)