One identifier landed on 2026-07-14, with LibreOffice carrying the sole finding of the day and a stack-buffer-overflow as the bug class. Against the running corpus, the Mythos dashboard now stands at 2136 disclosed, 1730 acknowledged, 419 patched, and 456 CVEs/GHSAs published.
LibreOffice
CVE-2026-8356 is a stack-buffer-overflow in LibreOffice, catalogued in the Other ecosystem.
A single-identifier day is not a trivial one when that identifier lands in a document-processing suite deployed across millions of desktops and enterprise workstations. A stack-buffer-overflow in LibreOffice represents genuine exposure for any organization that opens untrusted files — a routine operation in nearly every office environment. With 456 CVEs/GHSAs on record and 2136 total disclosures, the Mythos corpus continues to show that memory-safety bugs in mature, widely-distributed desktop software are no rarity.
Source: Anthropic’s Mythos dashboard at https://red.anthropic.com/2026/cvd/
Backfilled: reconstructed from the revealed_at timestamps in Anthropic’s CVD payload (as of 2026-08-26T18:55:53.809770Z), not published live on 2026-07-14.