CVE-2026-3664— xlnt-community xlnt Encrypted XLSX File compound_document.cpp read_directory out-of-bounds
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-community xlnt 1.6.1及之前版本存在缓冲区错误漏洞，该漏洞源于对文件source/detail/cryptography/compound_document.cpp中函数read_directory的错误操作，可能导致越界读取。
Possible ATT&CK Techniques 1 AI
T1210 · Exploitation of Remote Services
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I. Basic Information for CVE-2026-3664
Vulnerability Information
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Vulnerability Title
xlnt-community xlnt Encrypted XLSX File compound_document.cpp read_directory out-of-bounds
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was determined in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::compound_document::read_directory of the file source/detail/cryptography/compound_document.cpp of the component Encrypted XLSX File Parser. Executing a manipulation can lead to out-of-bounds read. The attack is restricted to local execution. The exploit has been publicly disclosed and may be utilized. This patch is called 147. Applying a patch is advised to resolve 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
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
xlnt 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
xlnt是xlnt-community开源的一个C++语言库。 xlnt-community xlnt 1.6.1及之前版本存在缓冲区错误漏洞，该漏洞源于对文件source/detail/cryptography/compound_document.cpp中函数read_directory的错误操作，可能导致越界读取。
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-2026-3664
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-3664 (1)
Vendor Advisories for CVE-2026-3664 (2)
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Submit #764646: xlnt-community xlnt commit bceb706 and before Memory Corruption third-party-advisory
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CVE-2026-3664 xlnt-community xlnt Encrypted XLSX File compound_document.cpp read_directory out-of-bounds (Issue 141 / ID 147) vdb-entry technical-description
Proof of Concept for CVE-2026-3664 (2)
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Too many requests · GitHub exploit
Same Patch Batch · xlnt-community · 2026-03-07 · 3 CVEs total
| CVE-2026-3663 | 3.3 LOW | xlnt-community xlnt XLSX File compound_document.cpp xsgetn out-of-bounds |
| CVE-2026-3665 | 3.3 LOW | xlnt-community xlnt XLSX File xlsx_consumer.cpp read_office_document null pointer derefere |
IV. Related Vulnerabilities
Same product: xlnt
Same vendor: xlnt-community
Same weakness: CWE-125
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V. Comments for CVE-2026-3664
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