NULL pointer dereference in Xlnt-Community Xlnt
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (7.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000
Affected products
- Xlnt-Community Xlnt — versions 1.6.0, 1.6.1
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/xlnt-community/xlnt/issues/140 (issue-tracking, Exploit, Issue Tracking, Vendor Advisory)
- github.com/oneafter/0128/blob/main/xl4/repro (Exploit, exploit)
- github.com/xlnt-community/xlnt/ (Product, product)
Frequently asked questions
- What is CVE-2026-3665?
- CVE-2026-3665 is a low-severity vulnerability in Xlnt-Community Xlnt, classified under Improper Resource Shutdown or Release. CVSS score: 3.3/10. Published 2026-03-07.
- How severe is CVE-2026-3665?
- Low severity. CVSS v3 base score is 3.3 out of 10.