Vulnerability 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.
CVSS Score
5.6
MEDIUM
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
Related Weaknesses (CWE)
References
- https://drive.google.com/file/d/1XpulFyCGlq7Szzg5RsH-eRwZ6OyuSozl/view?usp=shari
- https://drive.google.com/file/d/1wq51px42eoJz2VQ1Qu9ObPVQVom9T9H_/view?usp=shari
- https://github.com/jedwing/CHMLib/blob/2bef8d063ec7d88a8de6fd9f0513ea42ac0fa21f/
- https://github.com/sumatrapdfreader/sumatrapdf/commit/08179946a745cf1605e4b96709
- https://drive.google.com/file/d/1XpulFyCGlq7Szzg5RsH-eRwZ6OyuSozl/view?usp=shari
FAQ
What is CVE-2025-48172?
CVE-2025-48172 is a vulnerability with a CVSS score of 5.6 (MEDIUM). 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.
How severe is CVE-2025-48172?
CVE-2025-48172 has been rated MEDIUM with a CVSS base score of 5.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-48172?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.