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.
Casky was already ahead
This CVE exploits attack patterns that Casky's 255matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.
CVE-2026-4430 is an out-of-bounds write vulnerability in LibreOffice that exploits improper handling of encryption salt parameters in crafted OOXML documents. When a specially constructed Office Open XML file with mismatched encryption salt values is processed, the vulnerability allows attackers to write data beyond allocated buffer boundaries. This affects LibreOffice versions 26.2 before 26.2.3 and 25.8 before 25.8.7, making it a critical risk for organizations and individual users who process untrusted documents. The high CVSS score of 7.8 reflects the potential for code execution and system compromise through a commonplace attack vector—malicious document delivery.
Casky.ai's platform maps this vulnerability to MITRE ATT&CK techniques TA0002 (Execution) and TA0003 (Persistence), with 255 relevant security skills enabling practitioners to detect exploitation patterns. Using Claude AI with extended reasoning, practitioners can identify suspicious OOXML processing anomalies, monitor for out-of-bounds memory access attempts during document parsing, and detect execution flows that follow document opening. The platform's skill coverage allows security teams to correlate indicators such as LibreOffice process memory violations, unexpected privilege escalation attempts post-document processing, and persistence mechanisms that attackers might establish through code execution. By leveraging these mapped techniques, practitioners gain visibility into both the initial execution phase and any follow-on persistence activities, enabling faster detection and response.
Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →
These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-4430.
Casky has 255 skills that investigate the attack patterns behind CVE-2026-4430. Run one and get CVSS-scored findings in 3 minutes.
Run the skill that detects this →analyzing-browser-forensics-with-hindsight
digital forensics · low
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red teaming · high
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extracting-config-from-agent-tesla-rat
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extracting-iocs-from-malware-samples
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digital forensics · low
hardening-docker-containers-for-production
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hardening-docker-daemon-configuration
container security · low
hardening-linux-endpoint-with-cis-benchmark
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hardening-windows-endpoint-with-cis-benchmark
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hunting-for-anomalous-powershell-execution
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hunting-for-ntlm-relay-attacks
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hunting-for-persistence-mechanisms-in-windows
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hunting-for-persistence-via-wmi-subscriptions
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hunting-for-registry-run-key-persistence
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implementing-alert-fatigue-reduction
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