CVE-2026-3663

HighCVSS 7.1/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.1/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Weakness enumeration

CWE-119 CWE-125

Affected software

Vendor	Product	Versions
xlnt-community	xlnt	1.6.0; 1.6.1

References

https://github.com/oneafter/0128/blob/main/xl3/reproExploit
https://github.com/xlnt-community/xlnt/Product
https://github.com/xlnt-community/xlnt/issues/139Exploit, Issue Tracking, Vendor Advisory
https://github.com/xlnt-community/xlnt/pull/147Issue Tracking
https://vuldb.com/?ctiid.349552Permissions Required, VDB Entry
https://vuldb.com/?id.349552Third Party Advisory, VDB Entry
https://vuldb.com/?submit.764644Third Party Advisory, VDB Entry

Timeline

Published: Mar 7, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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