CVE-2026-3463

LOW 3.3

xlnt-community xlnt Compound Document binary.hpp append heap-based overflow

CVSS Score

3.3

EPSS Score

0.0%

EPSS Percentile

0th

A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::binary_writer::append of the file source/detail/binary.hpp of the component Compound Document Parser. This manipulation causes heap-based buffer overflow. The attack can only be executed locally. The exploit has been made available to the public and could be used for attacks. Patch name: 147. It is suggested to install a patch to address this issue.

CWE	CWE-122 CWE-119
Vendor	xlnt-community
Product	xlnt
Published	Mar 3, 2026
Last Updated	Mar 3, 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.348530 vuldb.com: https://vuldb.com/?ctiid.348530 vuldb.com: https://vuldb.com/?submit.764643 github.com: https://github.com/xlnt-community/xlnt/issues/138 github.com: https://github.com/xlnt-community/xlnt/issues/138#issuecomment-3868381672 github.com: https://github.com/oneafter/0128/blob/main/xl2/repro github.com: https://github.com/xlnt-community/xlnt/pull/147 github.com: https://github.com/xlnt-community/xlnt/

Credits

🔍 Oneafter (VulDB User)