CVE-2026-3463: Xlnt-Community Xlnt

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Xlnt-Community Xlnt: up to and including 1.6.1

Published 2026-03-03. Last modified 2026-06-17.