An unknown threat actor has been observed using a large language model (LLM) agent to conduct post-compromise actions after obtaining initial access following the exploitation of a publicly-accessible Marimo network using a recently disclosed vulnerability. "The attacker compromised an internet-reachable Marimo notebook via CVE-2026-39987, extracted two cloud credentials from the compromised

Marimo contains an pre-authorization remote code execution vulnerability, allowing an unauthenticated attacked to shell access and execute arbitrary system commands.

A critical flaw, tracked as CVE-2026-39987, in the open-source Python notebook tool Marimo was exploited within 10 hours of disclosure. A critical flaw in Marimo, tracked as CVE-2026-39987 (CVSS score of 9.3) was exploited just 10 hours after disclosure (On April 8, 2026). Sysdig Threat Research Team observed exploitation of the Marimo flaw within 9 […]

A critical security vulnerability in Marimo, an open-source Python notebook for data science and analysis, has been exploited within 10 hours of public disclosure, according to findings from Sysdig. The vulnerability in question is CVE-2026-39987 (CVSS score: 9.3), a pre-authenticated remote code execution vulnerability impacting all versions of Marimo prior to and including