CVE-2026-79592

Received Received - Intake

Out-of-Bounds Read in libxls via OLE Summary Offsets

Publication date: 2026-09-10

Last updated on: 2026-09-10

Assigner: MITRE

Description

An out-of-bounds read vulnerability exists in the xls_dumpSummary() function of libxls 1.6.3 due to insufficient validation of file-controlled OLE summary offsets.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-10

Last Modified

2026-09-10

Generated

2026-09-11

AI Q&A

2026-09-11

EPSS Evaluated

N/A

NVD

CVE-2026-79592

Affected Vendors & Products

Vendor	Product	Version / Range
libxls	libxls	1.6.3

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This is an out-of-bounds read vulnerability in the xls_dumpSummary() function of libxls version 1.6.3. It occurs because the function does not properly validate OLE summary offsets controlled by the file, which can lead to reading memory outside the intended buffer.

Impact Analysis

An attacker could exploit this to read sensitive data from memory, crash the application, or potentially execute arbitrary code if combined with other vulnerabilities. This may affect applications using libxls to process untrusted XLS files.

Mitigation Strategies

Update libxls to the latest version beyond 1.6.3 to address the out-of-bounds read vulnerability in xls_dumpSummary().

Avoid opening untrusted Excel files, as they may trigger the vulnerability through malformed OLE summary offsets.

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