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CVE-2026-3663— xlnt-community xlnt XLSX File compound_document.cpp xsgetn out-of-bounds

CVSS 3.3 · Low EPSS 0.02% · P7
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I. Basic Information for CVE-2026-3663

Vulnerability Information
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Vulnerability Title
xlnt-community xlnt XLSX File compound_document.cpp xsgetn out-of-bounds
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
Source: NVD (National Vulnerability Database)
Vulnerability Title
xlnt 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
xlnt是xlnt-community开源的一个C++语言库。 xlnt 1.6.1及之前版本存在缓冲区错误漏洞，该漏洞源于对文件source/detail/cryptography/compound_document.cpp中函数xsgetn的错误操作，可能导致越界读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
xlnt-communityxlnt 1.6.0 -

II. Public POCs for CVE-2026-3663

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III. Intelligence Information for CVE-2026-3663

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Same Patch Batch · xlnt-community · 2026-03-07 · 3 CVEs total

CVE-2026-36643.3 LOWxlnt-community xlnt Encrypted XLSX File compound_document.cpp read_directory out-of-bounds
CVE-2026-36653.3 LOWxlnt-community xlnt XLSX File xlsx_consumer.cpp read_office_document null pointer derefere

IV. Related Vulnerabilities

Same product: xlnt
Same vendor: xlnt-community
Same weakness: CWE-125

V. Comments for CVE-2026-3663

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