CVE-2026-8357

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.

CVSS 4.0

5.4CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 12% of CVEs (scores of 2026-10-25)

CWEs

CWE-193, CWE-787, CWE-131

Published

2026-06-15

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

References

• https://www.libreoffice.org/about-us/security/advisories/cve-2026-8357
• https://access.redhat.com/errata/RHSA-2026:35839
• https://access.redhat.com/errata/RHSA-2026:36832
• https://access.redhat.com/errata/RHSA-2026:43423
• https://access.redhat.com/errata/RHSA-2026:43424

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