USN-8534-1: LibreOffice vulnerabilities
It was discovered that LibreOffice incorrectly handled importing DXF drawings. An attacker could use this issue to cause LibreOffice to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-6039) It was discovered that LibreOffice incorrectly handled certain ODF number formats. An attacker could use this issue to cause LibreOffice to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-6040) It was discovered that LibreOffice incorrectly handled importing EMF+ graphics. An attacker could use this issue to cause LibreOffice to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-6045) It was discovered that LibreOffice incorrectly handled importing PPT presentations. An attacker could use this issue to cause LibreOffice to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-8356) It was discovered that LibreOffice Calc incorrectly handled compiling certain formulas. An attacker could use this issue to cause LibreOffice to crash, resulting in a denial of service, or possily execute arbitrary code. (CVE-2026-8357) It was discovered that LibreOffice Calc incorrectly handled importing spreadsheet tracked changes. An attacker could use this issue to cause LibreOffice to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-8358)
CSIRTS triage
- What
- LibreOffice incorrectly handled various file formats, which could lead to crashes or arbitrary code execution.
- Who is affected
- Deployments of LibreOffice on Ubuntu 24.04 LTS and Ubuntu 26.04 LTS are affected.
- Urgency
- Remediation is urgent due to the potential for denial of service and arbitrary code execution by attackers.
- Action
- Update LibreOffice to the latest version available for Ubuntu 24.04 LTS and Ubuntu 26.04 LTS.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://ubuntu.com/security/notices/USN-8534-1
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-60390.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all scored CVEs.
- Low exploitation riskCVE-2026-60400.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all scored CVEs.
- Low exploitation riskCVE-2026-60450.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all scored CVEs.
- Low exploitation riskCVE-2026-83560.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all scored CVEs.
- Low exploitation riskCVE-2026-83570.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all scored CVEs.
- Low exploitation riskCVE-2026-83580.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-6039 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-6040 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-6045 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-8356 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-8357 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-8358 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
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