CVE-2026-4430

HIGHNVD 7.87.8—

7.8

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(high)
EPSS: 4.2%
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

Weakness Classification(1)

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

CWE-787Out-of-bounds Write

Data Freshness Timeline

(refreshed 12× in last 7d / 16× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-21 22:43 UTCepss_batch
2026-05-20 13:57 UTCEG score recompute
2026-05-20 13:57 UTCGHSA enrichment
2026-05-20 11:22 UTCepss_batch

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 4.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

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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CVE-2026-4430

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

Security — LibreOffice

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-4430?

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Advisory Details (1)

Frequently asked(5)

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