CVE-2026-3463 MEDIUM

CVE-2026-3463: xlnt-community xlnt Compound Document binary.hpp append heap-based overflow

Vendor Xlnt-Community
Product xlnt
Weakness CWE-122
Published March 3, 2026
Last update March 3, 2026

CVSS base score

4.8/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 3, 2026 CVE published
March 3, 2026 Record updated