Vulnerability Details CVE-2026-3663
A vulnerability was found in xlnt-community xlnt up to 1.6.1. This issue affects the function xlnt::detail::compound_document_istreambuf::xsgetn of the file source/detail/cryptography/compound_document.cpp of the component XLSX File Parser. Performing a manipulation results in out-of-bounds read. The attack is only possible with local access. The exploit has been made public and could be used. The patch is named 147. It is recommended to apply a patch to fix this issue.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 6.7%
CVSS Severity
CVSS v3 Score 3.3
CVSS v2 Score 1.7
References
Products affected by CVE-2026-3663
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cpe:2.3:a:xlnt-community:xlnt:0.9.0
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cpe:2.3:a:xlnt-community:xlnt:0.9.1
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cpe:2.3:a:xlnt-community:xlnt:0.9.2
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cpe:2.3:a:xlnt-community:xlnt:1.0.0
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cpe:2.3:a:xlnt-community:xlnt:1.1.0
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cpe:2.3:a:xlnt-community:xlnt:1.2.0
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cpe:2.3:a:xlnt-community:xlnt:1.3.0
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cpe:2.3:a:xlnt-community:xlnt:1.4.0
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cpe:2.3:a:xlnt-community:xlnt:1.5.0
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cpe:2.3:a:xlnt-community:xlnt:1.6.0
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cpe:2.3:a:xlnt-community:xlnt:1.6.1