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(11)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuure-java (4:25.8.7-0ubuntu0.25.10.1) @ questing2026-08-23ubuntu
ubuntuure-java (4:24.2.7-0ubuntu0.24.04.5) @ noble2026-08-23ubuntu
redhatlibreoffice-1:5.3.6.1-28.el7_92026-07-27redhat
redhatlibreoffice-1:6.4.7.2-18.el8_6.12026-07-14redhat
redhatlibreoffice-1:7.1.8.1-15.el9_4.12026-07-13redhat
redhatlibreoffice-1:7.1.8.1-14.el9_2.12026-07-13redhat
redhatlibreoffice-1:6.4.7.2-18.el8_8.12026-07-09redhat
redhatlibreoffice-1:6.4.7.2-18.el8_4.12026-07-09redhat
redhatlibreoffice-1:7.1.8.1-15.el9_6.12026-07-09redhat
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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libreoffice1:7.0.4-4 ... 4:7.6.4~rc1-1~bpo12+1 (402 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libreoffice4:7.4.5-3 ... 4:7.4.7-1~bpo11+1 (15 versions)4:7.4.7-1+deb12u11—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libreoffice4:25.2.3-2 ... 4:25.2.3-2+deb13u3~bpo12+1 (6 versions)4:25.2.3-2+deb13u4—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libreoffice4:25.2.3-2 ... 4:26.2.3.2-2~bpo13+1 (51 versions)4:26.2.3.2-2—

Weakness Classification(1)

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

Additional Vendor Advisories

(5)

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 4× in last 7d / 16× 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 191 total refreshes for this CVE.

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

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 99.9% 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.

Dependency Blast Radius

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