CVE-2026-3663 MEDIUM

CVE-2026-3663: xlnt-community xlnt XLSX File compound_document.cpp xsgetn out-of-bounds

Vendor Xlnt-Community
Product xlnt
Weakness CWE-125
Published March 7, 2026
Last update March 11, 2026
View on NVD All CVEs

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 vulnerability was found in xlnt-community xlnt up to 1.6.1. This issue affects the function xlnt::detail::compound_document_istreambuf::xsgetn of the file source/detail/cryptography/compound_document.cpp of the component XLSX File Parser. Performing a manipulation results in out-of-bounds read. The attack is only possible with local access. The exploit has been made public and could be used. The patch is named 147. It is recommended to apply a patch to fix this issue.

Key dates

02Disclosure timeline

March 7, 2026 CVE published
March 11, 2026 Record updated