Machine speed, hold the AI: Hand-rolled marimo CVE-2026-39987 exploit
KEVActive exploitation (KEV)
CISA KEV means this flaw has been seen exploited in real attacks — not predicted, observed. Treat it as urgent regardless of its score.
What to do
- On CISA KEV — actively exploited. Patch immediately.
Sysdig TRT details a hand-rolled attack against marimo's CVE-2026-39987 without AI, building custom Python tools to breach a cloud bastion host.
CVE · detail
- CVE-2026-39987nvd ↗KEVEPSS 99%
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