CVE-2026-3663 Details
Description
A vulnerability was found in xlnt-community xlnt up to 1.6.1. This issue affects the function xlnt::detail::compound_document_istreambuf::xsgetn of the file source/detail/cryptography/compound_document.cpp of the component XLSX File Parser. Performing a manipulation results in out-of-bounds read. The attack is only possible with local access. The exploit has been made public and could be used. The patch is named 147. It is recommended to apply a patch to fix this issue.
A heap-based buffer overflow vulnerability has been identified in the xlnt library, specifically in versions through 1.6.1. This issue arises in the XLSX file parser component, within the function 'xlnt::detail::compound_document_istreambuf::xsgetn'. The vulnerability allows for an out-of-bounds read, which could potentially be exploited to cause a crash or read sensitive data. The issue occurs when the parser processes encrypted XLSX files, particularly those using Agile Encryption. The problem stems from the stream buffer implementation accessing a sector index beyond the end of a vector that represents the stream's sector chain.
Users are advised to update to xlnt version 1.6.2, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 11, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/oneafter/0128/blob/main/xl3/repro | [email protected] | Exploit |
| https://github.com/xlnt-community/xlnt/ | [email protected] | Product |
| https://github.com/xlnt-community/xlnt/issues/139 | [email protected] | ExploitIssue TrackingVendor Advisory |
| https://github.com/xlnt-community/xlnt/pull/147 | [email protected] | Issue Tracking |
| https://vuldb.com/?ctiid.349552 | [email protected] | Permissions RequiredVDB Entry |
| https://vuldb.com/?id.349552 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.764644 | [email protected] | Third Party AdvisoryVDB Entry |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-119 | Improper Restriction of Operations within the Bounds of a Memory Buffer | [email protected] |
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| xlnt-community xlnt | <= 1.6.1 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Mar 10, 2026 | Initial Analysis | [email protected] |
| Mar 7, 2026 | New CVE Received | [email protected] |