How severe is CVE-2026-3665?

CVE-2026-3665 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-3665 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3665?

CVE-2026-3665 affects Xlnt-community Xlnt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3665?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-3665 have an EU (EUVD) identifier?

Yes. CVE-2026-3665 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10173.

When was CVE-2026-3665 published?

CVE-2026-3665 was published on 2026-03-07 and last updated on 2026-06-17.

CVE-2026-3665

CVE-2026-3665 is a low-severity vulnerability in Xlnt-community Xlnt with a CVSS 3.x base score of 3.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-404.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
CVSS v2: 1.7
CVSS v4: 1.9
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10173
Weakness: CWE-404
Affected product: Xlnt-community Xlnt
Published: 2026-03-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-3665?: 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.
How severe is CVE-2026-3665?: CVE-2026-3665 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-3665 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3665?: CVE-2026-3665 affects Xlnt-community Xlnt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3665?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3665 have an EU (EUVD) identifier?: Yes. CVE-2026-3665 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10173.
When was CVE-2026-3665 published?: CVE-2026-3665 was published on 2026-03-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:xlnt-community:xlnt:*:*:*:*:*:*:*:*

More vulnerabilities in Xlnt-community Xlnt

CVE-2026-3664 — Low (CVSS 3.3): A vulnerability was determined in xlnt-community xlnt up to 1.6.1. Impacted is the function…
CVE-2026-3663 — Low (CVSS 3.3): A vulnerability was found in xlnt-community xlnt up to 1.6.1. This issue affects the function…
CVE-2026-3463 — Low (CVSS 3.3): A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function…
CVE-2026-2703 — Low (CVSS 3.3): A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::decode_base64…

All CVEs affecting Xlnt-community Xlnt →

Other CWE-404 vulnerabilities

CVE-2023-24444 — Critical (CVSS 9.8): Jenkins OpenID Plugin 2.4 and earlier does not invalidate the previous session on login.
CVE-2024-31611 — Critical (CVSS 9.1): SeaCMS 12.9 has a file deletion vulnerability via admin_template.php.
CVE-2018-8450 — High (CVSS 8.8): A remote code execution vulnerability exists when Windows Search handles objects in memory, aka "Windows Search Remote…
CVE-2026-11317 — High (CVSS 8.7): A denial of service security issue exists in the affected product. The security issue stems from a fault occurring when…
CVE-2022-25762 — High (CVSS 8.6): If a web application sends a WebSocket message concurrently with the WebSocket connection closing when running on…
CVE-2020-26070 — High (CVSS 8.6): A vulnerability in the ingress packet processing function of Cisco IOS XR Software for Cisco ASR 9000 Series…

Browse all CWE-404 vulnerabilities →