CVE-2026-4430

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory published 2026-05-07. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

Out-of-bounds write vulnerability in The Document Foundation LibreOffice via crafted OOXML documents with mismatched encryption salt parameters.

This issue affects LibreOffice: from 26.2 before 26.2.3, from 25.8 before 25.8.7.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
0%
KEV
Not listed

Published

May 7, 2026

Last Modified

May 8, 2026

Advisory Details (1)

Auto-updated May 7, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Security — LibreOffice

https://www.libreoffice.org/about-us/security/advisories/cve-2026-4430

Vendor Advisories for CVE-2026-4430(6)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuure-java (4:24.2.7-0ubuntu0.24.04.5) @ noble2026-06-28ubuntu
ubuntuure-java (4:26.2.3.2-0ubuntu0.26.04.1) @ resolute2026-06-28ubuntu
redhatlibreoffice-1:6.4.7.2-20.el8_102026-06-24redhat
redhatlibreoffice-1:7.1.8.1-15.el9_8.12026-06-24redhat

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(1)

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

Additional Vendor Advisories

(2)

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 5× in last 7d / 15× 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 122 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-4430?
CVE-2026-4430 is a high vulnerability published on May 7, 2026. Out-of-bounds write vulnerability in The Document Foundation LibreOffice via crafted OOXML documents with mismatched encryption salt parameters. This issue affects LibreOffice: from 26.2 before 26.2.3, from 25.8 before 25.8.7.
When was CVE-2026-4430 disclosed?
CVE-2026-4430 was first published in the National Vulnerability Database on May 7, 2026, with the most recent update on May 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-4430 actively exploited?
CVE-2026-4430 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 99.8% of all scored CVEs.
What is the CVSS score of CVE-2026-4430?
CVE-2026-4430 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-4430?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4430, 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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