chmlib vulnerabilities

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• chmlib 2

Latest chmlib CVEs

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1. 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 2025-07-04

   Medium·CVSS 5.6 EPSS 0.18%

   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.

2. CVE-2007-0619 chmlib before 0.39 allows user-assisted remote attackers to execute arbitrary code via a crafted page block length in a CHM file, which triggers memory corruption.

   Published 2007-01-31

   High·CVSS 9.3 EPSS 4.6%

   chmlib before 0.39 allows user-assisted remote attackers to execute arbitrary code via a crafted page block length in a CHM file, which triggers memory corruption.

Sources: CVE.org, NVD, CISA KEV, FIRST EPSS, OSV and public exploit-reference metadata. Product matching comes from the published CVE records. A proof-of-concept means public code exists; it is not evidence of exploitation.