CVE-2026-3665

Name: CVE-2026-3665
Creator: NVD / NIST
Published: 2026-03-07T16:15:56.583+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 1.9/10EPSS 0.21%

Last modified Jun 17, 2026

CVE-2026-3665 is a low-severity vulnerability rated 1.9/10 on the CVSS scale. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.5/10

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

CVSS 4.0

1.9/10

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.21%

10.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Xlnt-Community	Xlnt	<= 1.6.1

References

https://github.com/oneafter/0128/blob/main/xl4/reproExploit
https://github.com/xlnt-community/xlnt/Product
https://github.com/xlnt-community/xlnt/issues/140Exploit, Issue Tracking, Vendor Advisory
https://vuldb.com/?ctiid.349554Permissions Required, VDB Entry
https://vuldb.com/?id.349554Third Party Advisory, VDB Entry
https://vuldb.com/?submit.764647Third Party Advisory, VDB Entry

Timeline

Published: Mar 7, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-3665?

How severe is CVE-2026-3665?

CVE-2026-3665 has a CVSS score of 1.9/10 (LOW severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.

How do I fix CVE-2026-3665?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-3665?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST