Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
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
- https://access.redhat.com/errata/RHSA-2026:43425
- https://access.redhat.com/errata/RHSA-2026:43460
- https://access.redhat.com/errata/RHSA-2026:43461
- https://access.redhat.com/errata/RHSA-2026:46386
- https://access.redhat.com/errata/RHSA-2026:46387
- https://access.redhat.com/security/cve/CVE-2026-8357
- https://bugzilla.redhat.com/show_bug.cgi?id=2488964
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8357.json
FAQ
What is CVE-2026-8357?
CVE-2026-8357 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 dept...
How severe is CVE-2026-8357?
CVE-2026-8357 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-8357?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.