CVE-2026-8357: Red Hat Enterprise Linux 6

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support: before 1:5.3.6.1-28.el7_9 (fixed in 1:5.3.6.1-28.el7_9)
  • Red Hat Red Hat Enterprise Linux 8: before 1:6.4.7.2-21.el8_10 (fixed in 1:6.4.7.2-21.el8_10)
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: before 1:6.4.7.2-18.el8_4.2 (fixed in 1:6.4.7.2-18.el8_4.2)
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On: before 1:6.4.7.2-18.el8_4.2 (fixed in 1:6.4.7.2-18.el8_4.2)
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: before 1:6.4.7.2-18.el8_6.2 (fixed in 1:6.4.7.2-18.el8_6.2)
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On: before 1:6.4.7.2-18.el8_6.2 (fixed in 1:6.4.7.2-18.el8_6.2)
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service: before 1:6.4.7.2-18.el8_8.2 (fixed in 1:6.4.7.2-18.el8_8.2)
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions: before 1:6.4.7.2-18.el8_8.2 (fixed in 1:6.4.7.2-18.el8_8.2)
  • Red Hat Red Hat Enterprise Linux 9: before 1:7.1.8.1-15.el9_8.2 (fixed in 1:7.1.8.1-15.el9_8.2)
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions: before 1:7.1.8.1-14.el9_2.2 (fixed in 1:7.1.8.1-14.el9_2.2)
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services For SAP Solutions: before 1:7.1.8.1-15.el9_4.2 (fixed in 1:7.1.8.1-15.el9_4.2)
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support: before 1:7.1.8.1-15.el9_6.2 (fixed in 1:7.1.8.1-15.el9_6.2)
  • The Document Foundation Libreoffice: from 26.2, before 26.2.4 (fixed in 26.2.4)

Published 2026-06-15. Last modified 2026-07-28.