CVE-2026-25920
Medium · 5.5CVSS
5.5
EPSS
0.3%
Published
Feb 9, 2026
CISA due date
—
The record
SumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, a heap out-of-bounds read vulnerability exists in SumatraPDF's MOBI HuffDic decompressor. The bounds check in AddCdicData() only validates half the range that DecodeOne() actually accesses. Opening a crafted .mobi file can read nearly (1 << codeLength) bytes beyond the CDIC dictionary buffer, leading to a crash.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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