CVE-2026-2703: Xlnt-Community Xlnt

Medium severity, CVSS 5.5. 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::decode_base64 of the file source/detail/cryptography/base64.cpp of the component Encrypted XLSX File Parser. Executing a manipulation can lead to off-by-one. The attack requires local access. The exploit has been made available to the public and could be used for attacks. This patch is called f2d7bf494e5c52706843cf7eb9892821bffb0734. Applying a patch is advised to resolve this issue.

Affected products

• Xlnt-Community Xlnt: up to and including 1.6.1

Published 2026-02-19. Last modified 2026-06-17.