CVE-2026-8357

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM 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 — 3 sources updated 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(medium)
EPSS
3.7%
KEV
Not listed

Published

June 15, 2026

Last Modified

July 22, 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(6)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuure-java (4:26.2.4.2-0ubuntu0.26.04.2) @ resolute2026-07-16ubuntu
redhatlibreoffice-1:7.1.8.1-15.el9_8.22026-07-08redhat
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.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 15× in last 7d / 97× 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.

Showing the most recent 100 of 111 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:25 UTCEPSS rescore
  3. 2026-07-21 15:25 UTCEPSS rescore
  4. 2026-07-20 17:08 UTCEPSS rescore
  5. 2026-07-19 14:31 UTCEPSS rescore
  6. 2026-07-19 02:29 UTCEPSS rescore
  7. 2026-07-18 10:04 UTCEPSS rescore
  8. 2026-07-16 22:58 UTCVendor advisory
  9. 2026-07-16 22:58 UTCGHSA enrichment
  10. 2026-07-16 17:03 UTCEPSS rescore
  11. 2026-07-16 08:35 UTCVendor advisory
  12. 2026-07-16 08:35 UTCGHSA enrichment
  13. 2026-07-15 19:48 UTCVendor advisory
  14. 2026-07-15 19:48 UTCGHSA enrichment
  15. 2026-07-15 16:57 UTCEPSS rescore
  16. 2026-07-15 08:18 UTCVendor advisory
  17. 2026-07-15 08:18 UTCGHSA enrichment
  18. 2026-07-15 02:00 UTCEPSS rescore
  19. 2026-07-14 21:17 UTCVendor advisory
  20. 2026-07-14 21:17 UTCGHSA enrichment
  21. 2026-07-14 10:18 UTCVendor advisory
  22. 2026-07-14 10:18 UTCGHSA enrichment
  23. 2026-07-13 22:31 UTCEPSS rescore
  24. 2026-07-13 19:09 UTCVendor advisory
  25. 2026-07-13 19:09 UTCGHSA enrichment
Show 75 more
  1. 2026-07-13 08:11 UTCVendor advisory
  2. 2026-07-13 08:11 UTCGHSA enrichment
  3. 2026-07-13 06:13 UTCEPSS rescore
  4. 2026-07-12 19:14 UTCVendor advisory
  5. 2026-07-12 19:14 UTCGHSA enrichment
  6. 2026-07-12 07:05 UTCVendor advisory
  7. 2026-07-12 07:05 UTCGHSA enrichment
  8. 2026-07-12 05:46 UTCEPSS rescore
  9. 2026-07-11 19:20 UTCVendor advisory
  10. 2026-07-11 19:20 UTCGHSA enrichment
  11. 2026-07-11 08:27 UTCEPSS rescore
  12. 2026-07-11 08:22 UTCVendor advisory
  13. 2026-07-11 08:22 UTCGHSA enrichment
  14. 2026-07-10 21:23 UTCVendor advisory
  15. 2026-07-10 21:23 UTCGHSA enrichment
  16. 2026-07-10 10:25 UTCVendor advisory
  17. 2026-07-10 10:25 UTCGHSA enrichment
  18. 2026-07-09 21:09 UTCVendor advisory
  19. 2026-07-09 21:09 UTCGHSA enrichment
  20. 2026-07-09 19:10 UTCEPSS rescore
  21. 2026-07-09 09:22 UTCVendor advisory
  22. 2026-07-09 09:22 UTCGHSA enrichment
  23. 2026-07-08 22:22 UTCVendor advisory
  24. 2026-07-08 22:22 UTCGHSA enrichment
  25. 2026-07-08 15:16 UTCEPSS rescore
  26. 2026-07-08 15:16 UTCEPSS rescore
  27. 2026-07-08 11:24 UTCVendor advisory
  28. 2026-07-08 11:24 UTCGHSA enrichment
  29. 2026-07-08 00:25 UTCVendor advisory
  30. 2026-07-08 00:25 UTCGHSA enrichment
  31. 2026-07-07 13:46 UTCEPSS rescore
  32. 2026-07-07 13:46 UTCEPSS rescore
  33. 2026-07-07 13:02 UTCVendor advisory
  34. 2026-07-07 13:02 UTCGHSA enrichment
  35. 2026-07-07 00:23 UTCVendor advisory
  36. 2026-07-07 00:23 UTCGHSA enrichment
  37. 2026-07-06 16:27 UTCEPSS rescore
  38. 2026-07-06 16:27 UTCEPSS rescore
  39. 2026-07-05 20:24 UTCGHSA enrichment
  40. 2026-07-05 09:26 UTCGHSA enrichment
  41. 2026-07-05 02:31 UTCEPSS rescore
  42. 2026-07-05 02:30 UTCEPSS rescore
  43. 2026-07-04 21:03 UTCGHSA enrichment
  44. 2026-07-04 10:04 UTCGHSA enrichment
  45. 2026-07-04 06:31 UTCEPSS rescore
  46. 2026-07-04 06:31 UTCEPSS rescore
  47. 2026-07-03 20:18 UTCGHSA enrichment
  48. 2026-07-03 09:20 UTCGHSA enrichment
  49. 2026-07-02 22:20 UTCGHSA enrichment
  50. 2026-07-02 11:18 UTCGHSA enrichment
  51. 2026-07-02 00:05 UTCGHSA enrichment
  52. 2026-07-01 15:07 UTCEPSS rescore
  53. 2026-07-01 13:07 UTCGHSA enrichment
  54. 2026-07-01 02:09 UTCEG score recompute▲ 2.40
  55. 2026-07-01 02:09 UTCGHSA enrichment
  56. 2026-06-30 23:22 UTCEPSS rescore
  57. 2026-06-30 04:33 UTCNVD updateCVSS v3 → 7.8 · severity → HIGH
  58. 2026-06-30 01:41 UTCGHSA enrichment
  59. 2026-06-29 14:06 UTCEPSS rescore
  60. 2026-06-29 01:14 UTCGHSA enrichment
  61. 2026-06-28 14:07 UTCEPSS rescore
  62. 2026-06-28 04:56 UTCEPSS rescore
  63. 2026-06-28 00:46 UTCGHSA enrichment
  64. 2026-06-27 03:08 UTCEPSS rescore
  65. 2026-06-27 00:17 UTCGHSA enrichment
  66. 2026-06-25 23:47 UTCGHSA enrichment
  67. 2026-06-25 13:50 UTCEPSS rescore
  68. 2026-06-24 23:19 UTCGHSA enrichment
  69. 2026-06-24 14:05 UTCEPSS rescore
  70. 2026-06-23 22:52 UTCGHSA enrichment
  71. 2026-06-23 21:33 UTCEPSS rescore
  72. 2026-06-22 22:24 UTCGHSA enrichment
  73. 2026-06-22 14:25 UTCEPSS rescore
  74. 2026-06-21 21:57 UTCGHSA enrichment
  75. 2026-06-21 14:56 UTCEPSS rescore

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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 22, 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 3.7% 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.

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