CVE-2026-8357

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory published 2026-06-15. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released this week
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
7.8
EG Score
7.8(high)
EPSS
3.6%
KEV
Not listed

Published

June 15, 2026

Last Modified

July 6, 2026

Advisory Details (1)

Auto-updated Jun 15, 2026
No patch confirmed yet.
generic

Security advisories — LibreOffice

https://www.libreoffice.org/about-us/security/advisories/cve-2026-8357

Vendor Advisories for CVE-2026-8357(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatlibreoffice-1:6.4.7.2-21.el8_102026-07-06redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 34× in last 7d / 77× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 00:23 UTCEG score recompute
  2. 2026-07-07 00:23 UTCVendor advisory
  3. 2026-07-07 00:23 UTCGHSA enrichment
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 16:27 UTCEPSS rescore
  6. 2026-07-05 20:24 UTCEG score recompute
  7. 2026-07-05 20:24 UTCGHSA enrichment
  8. 2026-07-05 09:26 UTCEG score recompute
  9. 2026-07-05 09:26 UTCGHSA enrichment
  10. 2026-07-05 02:31 UTCEPSS rescore
  11. 2026-07-05 02:30 UTCEPSS rescore
  12. 2026-07-04 21:03 UTCEG score recompute
  13. 2026-07-04 21:03 UTCGHSA enrichment
  14. 2026-07-04 10:04 UTCEG score recompute
  15. 2026-07-04 10:04 UTCGHSA enrichment
  16. 2026-07-04 06:31 UTCEPSS rescore
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-03 20:18 UTCEG score recompute
  19. 2026-07-03 20:18 UTCGHSA enrichment
  20. 2026-07-03 09:20 UTCEG score recompute
  21. 2026-07-03 09:20 UTCGHSA enrichment
  22. 2026-07-02 22:21 UTCEG score recompute
  23. 2026-07-02 22:20 UTCGHSA enrichment
  24. 2026-07-02 11:18 UTCEG score recompute
  25. 2026-07-02 11:18 UTCGHSA enrichment
Show 52 more
  1. 2026-07-02 00:05 UTCEG score recompute
  2. 2026-07-02 00:05 UTCGHSA enrichment
  3. 2026-07-01 15:07 UTCEPSS rescore
  4. 2026-07-01 13:07 UTCEG score recompute
  5. 2026-07-01 13:07 UTCGHSA enrichment
  6. 2026-07-01 02:09 UTCEG score recompute▲ 2.40
  7. 2026-07-01 02:09 UTCGHSA enrichment
  8. 2026-06-30 23:22 UTCEPSS rescore
  9. 2026-06-30 04:33 UTCNVD updateCVSS v3 → 7.8 · severity → HIGH
  10. 2026-06-30 01:41 UTCEG score recompute
  11. 2026-06-30 01:41 UTCGHSA enrichment
  12. 2026-06-29 14:06 UTCEPSS rescore
  13. 2026-06-29 01:14 UTCEG score recompute
  14. 2026-06-29 01:14 UTCGHSA enrichment
  15. 2026-06-28 14:07 UTCEPSS rescore
  16. 2026-06-28 04:56 UTCEPSS rescore
  17. 2026-06-28 00:46 UTCEG score recompute
  18. 2026-06-28 00:46 UTCGHSA enrichment
  19. 2026-06-27 03:08 UTCEPSS rescore
  20. 2026-06-27 00:18 UTCEG score recompute
  21. 2026-06-27 00:17 UTCGHSA enrichment
  22. 2026-06-25 23:47 UTCEG score recompute
  23. 2026-06-25 23:47 UTCGHSA enrichment
  24. 2026-06-25 13:50 UTCEPSS rescore
  25. 2026-06-24 23:19 UTCEG score recompute
  26. 2026-06-24 23:19 UTCGHSA enrichment
  27. 2026-06-24 14:05 UTCEPSS rescore
  28. 2026-06-23 22:52 UTCEG score recompute
  29. 2026-06-23 22:52 UTCGHSA enrichment
  30. 2026-06-23 21:33 UTCEPSS rescore
  31. 2026-06-22 22:24 UTCEG score recompute
  32. 2026-06-22 22:24 UTCGHSA enrichment
  33. 2026-06-22 14:25 UTCEPSS rescore
  34. 2026-06-21 21:57 UTCEG score recompute
  35. 2026-06-21 21:57 UTCGHSA enrichment
  36. 2026-06-21 14:56 UTCEPSS rescore
  37. 2026-06-21 01:59 UTCEPSS rescore
  38. 2026-06-20 20:22 UTCEG score recompute
  39. 2026-06-20 20:21 UTCGHSA enrichment
  40. 2026-06-19 19:53 UTCEG score recompute
  41. 2026-06-19 19:53 UTCGHSA enrichment
  42. 2026-06-19 19:26 UTCEPSS rescore
  43. 2026-06-18 19:24 UTCEG score recompute
  44. 2026-06-18 19:24 UTCGHSA enrichment
  45. 2026-06-17 18:56 UTCEG score recompute
  46. 2026-06-17 18:56 UTCGHSA enrichment
  47. 2026-06-17 17:53 UTCEPSS rescore
  48. 2026-06-16 18:29 UTCEG score recompute
  49. 2026-06-16 18:28 UTCGHSA enrichment
  50. 2026-06-16 17:53 UTCEPSS rescore
  51. 2026-06-15 17:54 UTCEG score recompute
  52. 2026-06-15 17:53 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-8357?
CVE-2026-8357 is a high vulnerability published on June 15, 2026. 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…
When was CVE-2026-8357 disclosed?
CVE-2026-8357 was first published in the National Vulnerability Database on June 15, 2026, with the most recent update on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8357 actively exploited?
CVE-2026-8357 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8357?
CVE-2026-8357 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-8357?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8357, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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