CVE-2026-8356

Name	CVE-2026-8356
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-6346-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libreoffice (PTS)	bullseye	1:7.0.4-4+deb11u10	vulnerable
	bullseye (security)	1:7.0.4-4+deb11u13	vulnerable
	bookworm	4:7.4.7-1+deb12u12	vulnerable
	bookworm (security)	4:7.4.7-1+deb12u11	vulnerable
	trixie	4:25.2.3-2+deb13u4	vulnerable
	trixie (security)	4:25.2.3-2+deb13u5	fixed
	forky, sid	4:26.2.4.2-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libreoffice	source	trixie	4:25.2.3-2+deb13u5		DSA-6346-1
libreoffice	source	(unstable)	(unfixed)

https://www.libreoffice.org/about-us/security/advisories/cve-2026-8356