Home/CVE/Out-of-bounds write vulnerability in The Document Foundation LibreOffice via crafted OOXML documents with mismatched enc
CVE

CVE-2026-4430

Out-of-bounds write vulnerability in The Document Foundation LibreOffice via crafted OOXML documents with mismatched enc

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.

HIGH · CVSS 7.8 EPSS 0.00016
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-787Out-of-bounds Write
▤

Affected Products & Versions

2
libreoffice>= 25.8.0.0 and < 25.8.7.0
libreoffice>= 26.2.0.0 and < 26.2.3.0
▣

Scoring & Timeline

7.8
HIGH · CVSS v3.1 · security@documentfoundation.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD07 May 2026 · 08:16 AM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
usnUSN-8352-1
usnUSN-8340-1
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.libreoffice.org/about-us/security/advisories/cve-2026-4430Vendor Advisory
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