CVE-2026-4430: CWE-787 Out-of-bounds write in The Document Foundation LibreOffice
An out-of-bounds write vulnerability exists in The Document Foundation's LibreOffice when processing crafted OOXML documents with mismatched encryption salt parameters. This affects LibreOffice versions 26.2 before 26.2.3 and 25.8 before 25.8.7. The vulnerability is classified under CWE-787 and has a medium severity with a CVSS 4.0 base score of 5.
AI Analysis
Technical Summary
CVE-2026-4430 is an out-of-bounds write vulnerability in LibreOffice related to handling OOXML documents that contain mismatched encryption salt parameters. This flaw affects LibreOffice versions starting from 25.8 up to but not including 25.8.7, and from 26.2 up to but not including 26.2.3. The vulnerability could potentially lead to memory corruption due to improper bounds checking during document processing. The CVSS 4.0 vector indicates local attack vector with low complexity, no privileges required, user interaction needed, and high impact on availability.
Potential Impact
Successful exploitation of this vulnerability could result in memory corruption, potentially causing application crashes or other unintended behavior impacting availability. There is no evidence of known exploits in the wild. The impact is rated medium severity based on the CVSS score of 5.4.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official patch or remediation level is provided, users should monitor The Document Foundation's advisories for updates. Until a fix is available, avoid opening untrusted OOXML documents that could trigger this vulnerability.
CVE-2026-4430: CWE-787 Out-of-bounds write in The Document Foundation LibreOffice
Description
An out-of-bounds write vulnerability exists in The Document Foundation's LibreOffice when processing crafted OOXML documents with mismatched encryption salt parameters. This affects LibreOffice versions 26.2 before 26.2.3 and 25.8 before 25.8.7. The vulnerability is classified under CWE-787 and has a medium severity with a CVSS 4.0 base score of 5.
CVSS v4.0
Score 5.4medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-4430 is an out-of-bounds write vulnerability in LibreOffice related to handling OOXML documents that contain mismatched encryption salt parameters. This flaw affects LibreOffice versions starting from 25.8 up to but not including 25.8.7, and from 26.2 up to but not including 26.2.3. The vulnerability could potentially lead to memory corruption due to improper bounds checking during document processing. The CVSS 4.0 vector indicates local attack vector with low complexity, no privileges required, user interaction needed, and high impact on availability.
Potential Impact
Successful exploitation of this vulnerability could result in memory corruption, potentially causing application crashes or other unintended behavior impacting availability. There is no evidence of known exploits in the wild. The impact is rated medium severity based on the CVSS score of 5.4.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official patch or remediation level is provided, users should monitor The Document Foundation's advisories for updates. Until a fix is available, avoid opening untrusted OOXML documents that could trigger this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Document Fdn.
- Date Reserved
- 2026-03-19T14:58:41.694Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fc4109cbff5d8610b85d64
Added to database: 05/07/2026, 07:36:41 UTC
Last enriched: 05/14/2026, 10:52:06 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 146
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