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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.

PUBLISHED Reserved 2026-03-06 | Published 2026-03-07 | Updated 2026-03-07 | Assigner VulDB




MEDIUM: 4.8CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
LOW: 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
LOW: 3.3CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
1.7AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C

Problem types

Out-of-Bounds Read

Memory Corruption

Product status

1.6.0
affected

1.6.1
affected

Timeline

2026-03-06:Advisory disclosed
2026-03-06:VulDB entry created
2026-03-06:VulDB entry last update

Credits

Oneafter (VulDB User) reporter

References

vuldb.com/?id.349552 (VDB-349552 | xlnt-community xlnt XLSX File compound_document.cpp xsgetn out-of-bounds) vdb-entry technical-description

vuldb.com/?ctiid.349552 (VDB-349552 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.764644 (Submit #764644 | xlnt-community xlnt commit bceb706 and before Heap-based Buffer Overflow) third-party-advisory

github.com/xlnt-community/xlnt/issues/139 issue-tracking

github.com/oneafter/0128/blob/main/xl3/repro exploit

github.com/xlnt-community/xlnt/pull/147 issue-tracking patch

github.com/xlnt-community/xlnt/ product

cve.org (CVE-2026-3663)

nvd.nist.gov (CVE-2026-3663)

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