CVE-2026-63277Network attack vectorHinoki check available

Code execution via remote JDBC driver loading

Published Oct 5, 2026 · Updated Oct 5, 2026

Remote code execution in LibreOffice before 26.2.5 allows remote attackers to run Java code when a crafted Calc spreadsheet is opened. A saved SQL data mapping passes a document-named remote Java database driver into the JDBC class path, causing its code to load. Exploitation requires a user to open the document on an installation with Java integration available; the code runs in that user's context.

CVSS severityUnavailable
Unscored
EPSS probability0.15%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Remote code execution in LibreOffice before 26.2.5 allows remote attackers to run Java code when a crafted Calc spreadsheet is opened. A saved SQL data mapping passes a document-named remote Java database driver into the JDBC class path, causing its code to load. Exploitation requires a user to open the document on an installation with Java integration available; the code runs in that user's context.

The record

CVE
CVE-2026-63277
Published
Oct 5, 2026
Updated
Oct 5, 2026
Vendor
The Document Foundation
Product
LibreOffice
Classifications
T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 5, 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.

  1. Affected versionversion=26.2 << 26.2.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Document Foundation · LibreOfficeversion=26.2 << 26.2.5

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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