CVE-2026-8357
A heap buffer overflow existed when compiling a very long formula made up of many opening tokens.
Does this matter?
Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own.
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 4.0
- 5.4 MEDIUMCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.22% probability · 12th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-193, CWE-787, CWE-131
- Source
- security@documentfoundation.org
EPSS 0.2% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.