CVE-2026-3663

medium

Description

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.

References

https://vuldb.com/?submit.764644

https://vuldb.com/?id.349552

https://github.com/oneafter/0128/blob/main/xl3/repro

https://vuldb.com/?ctiid.349552

https://github.com/xlnt-community/xlnt/pull/147

https://github.com/xlnt-community/xlnt/issues/139

https://github.com/xlnt-community/xlnt/

Details

Source: Mitre, NVD

Published: 2026-03-07

Updated: 2026-03-10

Risk Information

CVSS v2

Base Score: 1.7

Vector: CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:P

Severity: Low

CVSS v3

Base Score: 7.1

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Severity: High

CVSS v4

Base Score: 4.8

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

Severity: Medium

EPSS

EPSS: 0.00013