Vulnerability Details CVE-2026-25920
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 2.0%
CVSS Severity
CVSS v3 Score 5.5
References
Products affected by CVE-2026-25920
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:0.1
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:0.2
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:0.3
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:0.4
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:0.5
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:0.6
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:0.7
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:0.8
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:0.8.1
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:0.9
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:0.9.1
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:0.9.2
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:0.9.3
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:0.9.4
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:1.0
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:1.0.1
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:1.1
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:1.2
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:1.3
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:1.4
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:1.5
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:1.5.1
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:1.6
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:1.7
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:1.8
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:1.9
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:2.0
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:2.0.1
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:2.1
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:2.1.1
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:2.2
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:2.2.1
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:2.3
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:2.3.1
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:2.3.2
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:2.4
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:2.5
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:2.5.1
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:2.5.2
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:3.0
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:3.1
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:3.1.1
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:3.1.2
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cpe:2.3:a:sumatrapdfreader:sumatrapdf:3.4.6