---
id: CVE-2026-79592
title: >-
  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.
summary: >-
  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.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-125
published: '2026-09-10'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:00:03.713'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-79592'
references:
  - url: 'https://github.com/libxls/libxls/issues/162'
    label: cve@mitre.org
  - url: >-
      https://github.com/libxls/libxls/pull/165/changes/6eed8bc1d51d6649faebab0184b21ab8768d8fa6
    label: cve@mitre.org
  - url: 'https://github.com/libxls/libxls/issues/162'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00432
epssPercentile: 0.34882
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-11T14:57:47.729086Z'
ingestedAt: '2026-09-14T00:21:19.111Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.