Is CVE-2026-3665 actively exploited?

CVE-2026-3665 has no public evidence of in-the-wild exploitation as of 2026-04-29.

What is the CVSS score for CVE-2026-3665?

CVE-2026-3665 has a CVSS score of 1.9 (LOW severity). 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/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.

How do I patch CVE-2026-3665?

Patch guidance is available from xlnt-community security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-3665.

Which products are affected by CVE-2026-3665?

1 product: xlnt-community xlnt.

CVE-2026-3665 - remediation guidance & executive summary

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.

CVSS Metrics

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/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
Attack Vector: local
Complexity: low
Privileges: low
User Action: none
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-404 CWE-476 · NULL Pointer Dereference

Metadata

Primary Vendor: XLNT-COMMUNITY
Published: 3/7/2026
Last Modified: 4/29/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-3665

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary