CVE-2026-3665: Xlnt-Community Xlnt

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

A vulnerability was identified in xlnt-community xlnt up to 1.6.1. The affected element is the function xlnt::detail::xlsx_consumer::read_office_document of the file source/detail/serialization/xlsx_consumer.cpp of the component XLSX File Parser. The manipulation leads to null pointer dereference. The attack must be carried out locally. The exploit is publicly available and might be used.

Affected products

• Xlnt-Community Xlnt: up to and including 1.6.1

Published 2026-03-07. Last modified 2026-06-17.