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CVE-2026-3665— xlnt-community xlnt XLSX File xlsx_consumer.cpp read_office_document null pointer dereference

Quick assessment

Affected
xlnt-community xlnt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

xlnt是xlnt-community开源的一个C++语言库。 xlnt 1.6.1及之前版本存在代码问题漏洞，该漏洞源于对文件source/detail/serialization/xlsx_consumer.cpp中函数read_office_document的错误操作，可能导致空指针取消引用。

CVSS 3.3 · Low EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-3665

Vulnerability Information
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Vulnerability Title
xlnt-community xlnt XLSX File xlsx_consumer.cpp read_office_document null pointer dereference
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
xlnt 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
xlnt是xlnt-community开源的一个C++语言库。 xlnt 1.6.1及之前版本存在代码问题漏洞，该漏洞源于对文件source/detail/serialization/xlsx_consumer.cpp中函数read_office_document的错误操作，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
xlnt-community xlnt 1.6.0 -

II. Public POCs for CVE-2026-3665

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III. Intelligence Information for CVE-2026-3665

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Vendor Advisories for CVE-2026-3665 (2)

Other References for CVE-2026-3665 (2)

Same Patch Batch · xlnt-community · 2026-03-07 · 3 CVEs total

CVE-2026-3664 3.3 LOW xlnt-community xlnt Encrypted XLSX File compound_document.cpp read_directory out-of-bounds
CVE-2026-3663 3.3 LOW xlnt-community xlnt XLSX File compound_document.cpp xsgetn out-of-bounds

IV. Related Vulnerabilities

Same product: xlnt
Same vendor: xlnt-community
Same weakness: CWE-476

V. Comments for CVE-2026-3665

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