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CVE-2026-8357

High

Description

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.

SeverityHigh
CVSS7.8
Exploit probability—
ProductLibreOffice
PublishedJun 15, 2026
First seenJun 15, 2026
Weakness typeCWE-787Out-of-bounds writeCWE-193CWE-193

How to fix

Update
  • The Document Foundation LibreOffice< 26.2.4 or later
Vendor advisories

Affected products

ProductAffected versionsFixed in
The Document Foundation LibreOffice26.2 ≤ v < < 26.2.4< 26.2.4

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