---
id: CVE-2026-8357
title: LibreOffice Calc compiles cell formulas when opening a spreadsheet
summary: >-
  LibreOffice Calc compiles cell formulas when opening a spreadsheet. A heap
  buffer overflow existed when compiling a very long formula made up of many
  opening tokens. The array that tracks nesting depth was allocated one element
  too small…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-193
  - CWE-787
  - CWE-131
published: '2026-06-15'
updated: '2026-07-06'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-8357'
references:
  - url: 'https://www.libreoffice.org/about-us/security/advisories/cve-2026-8357'
    label: security@documentfoundation.org
  - url: 'https://access.redhat.com/errata/RHSA-2026:35839'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-8357'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2488964'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8357.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00227
epssPercentile: 0.12006
ingestedAt: '2026-07-06T17:44:51.193Z'
---

## Overview

LibreOffice Calc compiles cell formulas when opening a spreadsheet. A heap buffer overflow existed when compiling a very long formula made up of many opening tokens. The array that tracks nesting depth was allocated one element too small for that worst case, so such a formula wrote one element past its end. In fixed versions the array is sized to hold the largest possible nesting.

## Remediation

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