Heap buffer overflow when replaying deferred OOXML parser events for a
text box element, fixed upstream in LibreOffice 25.8.7 and 26.2.3.
Debian trixie ships LibreOffice 25.2.3, which does not contain the
vulnerable code: the Debian security team marks trixie (and bookworm)
as not-affected ("Vulnerable code not present"). No Echo patch is
required. Re-evaluate if this spec is ever rebased to a newer
LibreOffice release that predates the upstream fix.
https://security-tracker.debian.org/tracker/CVE-2026-6047