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Fencer Vulns
medium 5.4

CVE-2026-8356 json

Stack buffer overflow in PPT presentation import

published 2026-06-15 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-36738

cvss
5.4
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

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.

Patch / fix

  • The Document Foundation LibreOffice < 26.2.4
  • libreoffice Debian 12 4:7.4.7-1+deb12u13
  • libreoffice Debian 13 4:25.2.3-2+deb13u5
  • libreoffice Debian 14 4:26.2.4.2-1

debian advisories DEBIAN-CVE-2026-8356

  • libreoffice Ubuntu 22.04 LTS 1:7.3.7-0ubuntu0.22.04.12
  • libreoffice Ubuntu 24.04 LTS 4:24.2.7-0ubuntu0.24.04.6
  • libreoffice Ubuntu 26.04 LTS 4:26.2.4.2-0ubuntu0.26.04.2

ubuntu advisories UBUNTU-CVE-2026-8356

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libreoffice SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 26.2.5.1-150500.20.37.1

suse advisories SUSE-SU-2026:3140-1

  • libreoffice openSUSE Leap 16.0 26.8.1.1-bp160.1.1

opensuse advisories openSUSE-SU-2026:22216-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-8356 updated cvss 5.5

libreoffice: LibreOffice: Denial of Service via a specially crafted PPT file

  • Red Hat Enterprise Linux 6 autocorr-af, autocorr-bg, autocorr-ca, autocorr-cs, autocorr-da, autocorr-de, +60 more Red Hat Enterprise Linux 7 autocorr-af, autocorr-bg, autocorr-ca, autocorr-cs, autocorr-da, autocorr-de, +105 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 autocorr-af, autocorr-bg, autocorr-ca, autocorr-cs, autocorr-da, autocorr-de, +98 more Red Hat Enterprise Linux 9 autocorr-af, autocorr-bg, autocorr-ca, autocorr-cs, autocorr-da, autocorr-de, +101 more
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 5.4 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
CNA 4.0 5.4 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

Affected products

  • The Document Foundation LibreOffice

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.