CVE-2026-3663
xlnt-community xlnt XLSX File compound_document.cpp xsgetn out-of-bounds
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.
INFO
Published Date :
March 7, 2026, 3:15 p.m.
Last Modified :
March 10, 2026, 8:29 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | LOW | [email protected] | ||||
| CVSS 3.1 | LOW | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Apply patch 147.
- Update xlnt-community xlnt to a fixed version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-3663.
| URL | Resource |
|---|---|
| https://github.com/oneafter/0128/blob/main/xl3/repro | Exploit |
| https://github.com/xlnt-community/xlnt/ | Product |
| https://github.com/xlnt-community/xlnt/issues/139 | Exploit Issue Tracking Vendor Advisory |
| https://github.com/xlnt-community/xlnt/pull/147 | Issue Tracking |
| https://vuldb.com/?ctiid.349552 | Permissions Required VDB Entry |
| https://vuldb.com/?id.349552 | Third Party Advisory VDB Entry |
| https://vuldb.com/?submit.764644 | Third Party Advisory VDB Entry |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-3663 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-3663
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-3663 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-3663 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 10, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:xlnt-community:xlnt:*:*:*:*:*:*:*:* versions up to (including) 1.6.1 Added Reference Type VulDB: https://github.com/oneafter/0128/blob/main/xl3/repro Types: Exploit Added Reference Type VulDB: https://github.com/xlnt-community/xlnt/ Types: Product Added Reference Type VulDB: https://github.com/xlnt-community/xlnt/issues/139 Types: Exploit, Issue Tracking, Vendor Advisory Added Reference Type VulDB: https://github.com/xlnt-community/xlnt/pull/147 Types: Issue Tracking Added Reference Type VulDB: https://vuldb.com/?ctiid.349552 Types: Permissions Required, VDB Entry Added Reference Type VulDB: https://vuldb.com/?id.349552 Types: Third Party Advisory, VDB Entry Added Reference Type VulDB: https://vuldb.com/?submit.764644 Types: Third Party Advisory, VDB Entry -
New CVE Received by [email protected]
Mar. 07, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Added CVSS V2 (AV:L/AC:L/Au:S/C:N/I:N/A:P) Added CWE CWE-119 Added CWE CWE-125 Added Reference https://github.com/oneafter/0128/blob/main/xl3/repro Added Reference https://github.com/xlnt-community/xlnt/ Added Reference https://github.com/xlnt-community/xlnt/issues/139 Added Reference https://github.com/xlnt-community/xlnt/pull/147 Added Reference https://vuldb.com/?ctiid.349552 Added Reference https://vuldb.com/?id.349552 Added Reference https://vuldb.com/?submit.764644