CVE-2026-6040
High
Description
A heap use-after-free existed when importing the blank-width characters of an ODF number format. A position value read from the document was not checked against the length of the format-code string, so a malformed number format could be processed against memory outside that string. In fixed versions the position is bounds-checked before use.
SeverityHigh
CVSS7.3
Exploit probability5. percentile0.2%
ProductLibreOffice
PublishedJun 15, 2026
First seenJun 15, 2026
Weakness typeCWE-416Use after freeCWE-787Out-of-bounds write
How to fix
Update
- The Document Foundation LibreOffice< 25.8.7, < 26.2.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| The Document Foundation LibreOffice | 25.8 ≤ v < < 25.8.7, 26.2 ≤ v < < 26.2.3 | < 25.8.7, < 26.2.3 |
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