Is CVE-2026-8356 in the CISA KEV catalog?

No. CVE-2026-8356 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-8356?

CVE-2026-8356 has a CVSS v4 base score of 5.4 (MEDIUM).

What is the EPSS score for CVE-2026-8356?

CVE-2026-8356 has an EPSS score of 0.12% (2th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-8356?

Upgrade libreoffice on debian 12 to 4:7.4.7-1+deb12u13 or later.

CVE & CISA-KEV Catalog

CVE-2026-8356

MEDIUM

5.4

CVSS v4

NVD

Description

LibreOffice can import presentations in the legacy binary PPT format. A stack buffer overflow existed when importing a colour-replacement record. Two fixed-size colour tables were filled from the file, but the write position was not reset between the two passes over the record, so a file whose combined colour counts exceeded the table size wrote past the end of the tables on the stack. In fixed versions the unused second pass is no longer read into those tables.

CWE-121Stack-based Buffer Overflow CWE-787Out-of-bounds Write

How to fix

Remediation Available

libreofficeDebian

Fixed in:4:7.4.7-1+deb12u13CVE-2026-8356

Fixed in:4:25.2.3-2+deb13u5CVE-2026-8356

Fixed in:4:26.2.4.2-1CVE-2026-8356

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v4 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

Impact

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploit Intelligence

0.12%probability of exploitation in 30 days

2ndpercentile

Low risk: more likely to be exploited than 2% of all known CVEs.

References

Other references1

libreoffice.org

Embed a live status badge for CVE-2026-8356

Markdown

[![CVE-2026-8356](https://tridentstack.com/cve/badge/CVE-2026-8356.svg)](https://tridentstack.com/cve/CVE-2026-8356)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-8356"><img src="https://tridentstack.com/cve/badge/CVE-2026-8356.svg" alt="CVE-2026-8356"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.