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CVE-2026-3663

Published: Mar 7, 2026

Modified: Mar 11, 2026

PUBLISHED

CVSS v3.1

3.3

LOW

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.

Vendor	Product	Versions
xlnt-community	xlnt	affected `1.6.0` affected `1.6.1`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

References

VDB-349552 | xlnt-community xlnt XLSX File compound_document.cpp xsgetn out-of-bounds

vdb-entry

technical-description

VDB-349552 | CTI Indicators (IOB, IOC, IOA)

signature

permissions-required

Submit #764644 | xlnt-community xlnt commit bceb706 and before Heap-based Buffer Overflow

third-party-advisory

https://github.com/xlnt-community/xlnt/issues/139

issue-tracking

https://github.com/oneafter/0128/blob/main/xl3/repro

exploit

https://github.com/xlnt-community/xlnt/pull/147

issue-tracking

patch

https://github.com/xlnt-community/xlnt/

product

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