CVE-2026-3463— xlnt-community xlnt Compound Document binary.hpp append heap-based overflow
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及之前版本存在安全漏洞，该漏洞源于组件Compound Document Parser的文件source/detail/binary.hpp中函数xlnt::detail::binary_writer::append存在堆缓冲区溢出。
Possible ATT&CK Techniques 3 AI
T1059 · Command and Scripting Interpreter T1068 · Exploitation for Privilege Escalation T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-3463
Vulnerability Information
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Vulnerability Title
xlnt-community xlnt Compound Document binary.hpp append heap-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::binary_writer::append of the file source/detail/binary.hpp of the component Compound Document Parser. This manipulation causes heap-based buffer overflow. The attack can only be executed locally. The exploit has been made available to the public and could be used for attacks. Patch name: 147. It is suggested to install a patch to address this issue.
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
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
xlnt 安全漏洞
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及之前版本存在安全漏洞，该漏洞源于组件Compound Document Parser的文件source/detail/binary.hpp中函数xlnt::detail::binary_writer::append存在堆缓冲区溢出。
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-2026-3463
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-3463 (1)
Vendor Advisories for CVE-2026-3463 (3)
-
CVE-2026-3463 xlnt-community xlnt Compound Document binary.hpp append heap-based overflow (Issue 138 / ID 147) vdb-entry technical-description
Proof of Concept for CVE-2026-3463 (2)
IV. Related Vulnerabilities
V. Comments for CVE-2026-3463
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