CVE-2026-3663

LOW 3.3

xlnt-community xlnt XLSX File compound_document.cpp xsgetn out-of-bounds

CVSS Score

3.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-125 CWE-119
Vendor	xlnt-community
Product	xlnt
Published	Mar 7, 2026
Last Updated	Mar 11, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

xlnt-community / xlnt

1.6.0 1.6.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/?id.349552 vuldb.com: https://vuldb.com/?ctiid.349552 vuldb.com: https://vuldb.com/?submit.764644 github.com: https://github.com/xlnt-community/xlnt/issues/139 github.com: https://github.com/oneafter/0128/blob/main/xl3/repro github.com: https://github.com/xlnt-community/xlnt/pull/147 github.com: https://github.com/xlnt-community/xlnt/

Credits

🔍 Oneafter (VulDB User)