Memory corruption via mismatched OOXML salt lengths
Published May 7, 2026 · Updated May 7, 2026
Out-of-bounds write in LibreOffice 25.8 before 25.8.7 and 26.2 before 26.2.3 allows attackers to corrupt memory via crafted OOXML files. AgileEngine::readEncryptionInfo accepted decoded keyDataSalt data whose byte length differed from the declared saltSize, allowing later processing to write outside a heap buffer. Opening an attacker-supplied document is required; the write can crash LibreOffice or alter process memory, with no reported cross-system impact.
Summary
What happened
Out-of-bounds write in LibreOffice 25.8 before 25.8.7 and 26.2 before 26.2.3 allows attackers to corrupt memory via crafted OOXML files. AgileEngine::readEncryptionInfo accepted decoded keyDataSalt data whose byte length differed from the declared saltSize, allowing later processing to write outside a heap buffer. Opening an attacker-supplied document is required; the write can crash LibreOffice or alter process memory, with no reported cross-system impact.
The record
- CVE
- CVE-2026-4430
- Published
- May 7, 2026
- Updated
- May 7, 2026
- Vendor
- The Document Foundation
- Product
- LibreOffice
- Classifications
- CWE-787, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 7, 2026CVE publishedPublication date reported by the CVE source.
- May 7, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=25.8 <25.8.7
- Affected versionversion=26.2 <26.2.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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