Which versions of Xlnt are affected by CVE-2026-3665?

CVE-2026-3665 is a low-severity vulnerability in xlnt-community xlnt (CVSS 3.3). The limited severity suggests constrained impact, typically requiring specific conditions or local access for…

Is there a public PoC exploit available for CVE-2026-3665?

Yes, a public proof-of-concept exploit is available for CVE-2026-3665. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-3665?

During next maintenance window: Apply vendor patches when convenient. Monitor vendor channels for updates.

Xlnt CVE-2026-3665

Q: What is the CVSS score of CVE-2026-3665?

CVE-2026-3665 has a CVSS 4.0 base score of 1.9 (Low). 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/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 exploitation probability: 0.0%.

LOW

Improper Resource Shutdown or Release (CWE-404)

2026-03-07 cna@vuldb.com

Denial Of Service Xlnt

1.9

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

1.9 LOW

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

CVSS changed

Apr 29, 2026 - 01:11 NVD

3.3 (LOW) 1.9 (LOW)

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Mar 10, 2026 - 20:37 vuln.today

Public exploit code

CVE Published

Mar 07, 2026 - 16:15 nvd

LOW 3.3

DescriptionCVE.org

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.

AnalysisAI

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Vulnerability AssessmentAI

Risk Assessment	CVSS 3.3 (LOW). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker could exploit this flaw, null pointer dereference.
Remediation	Monitor vendor advisories for a patch. Detailed patch versions, workarounds, and compensating controls in full report.

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During next maintenance window: Apply vendor patches when convenient. …

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CVE-2026-3665 vulnerability details – vuln.today

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