CVE-2026-3463 Details
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.
A heap-based buffer overflow vulnerability has been identified in xlnt-Community xlnt versions through 1.6.1. The issue arises in the Compound Document Parser, specifically within the 'xlnt::detail::binary_writer::append' function, located in 'source/detail/binary.hpp'. This vulnerability allows for heap corruption by writing data beyond the allocated buffer size. The problem occurs when the 'read_sector' function, called by 'read_msat', improperly handles the Master Sector Allocation Table, leading to a memory overflow. The vulnerability can be exploited locally, and a public exploit is available.
Users are advised to update to xlnt version 1.6.1 or later, 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 3, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/oneafter/0128/blob/main/xl2/repro | [email protected] | Exploit |
| https://github.com/xlnt-community/xlnt/ | [email protected] | Product |
| https://github.com/xlnt-community/xlnt/issues/138 | [email protected] | ExploitIssue TrackingVendor Advisory |
| https://github.com/xlnt-community/xlnt/issues/138#issuecomment-3868381672 | [email protected] | Issue Tracking |
| https://github.com/xlnt-community/xlnt/pull/147 | [email protected] | Issue Tracking |
| https://vuldb.com/?ctiid.348530 | [email protected] | Permissions RequiredVDB Entry |
| https://vuldb.com/?id.348530 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.764643 | [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-122 | Heap-based Buffer Overflow | [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 3, 2026 | New CVE Received | [email protected] |