CISA Adds One Known Exploited Vulnerability to Catalog

Summary

CISA has added CVE-2026-39987, a remote code execution vulnerability in Marimo, to its Known Exploited Vulnerabilities (KEV) Catalog due to evidence of active exploitation. Under Binding Operational Directive (BOD) 22-01, Federal Civilian Executive Branch agencies are required to remediate this vulnerability by a specified due date. CISA urges all organizations to prioritize remediation of KEV Catalog vulnerabilities as part of standard vulnerability management practices.

Full text

Alert CISA Adds One Known Exploited Vulnerability to Catalog Release DateApril 23, 2026 CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-39987 Marimo Remote Code Execution Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. See the BOD 22-01 Fact Sheet for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria. This product is provided subject to this Notification and this Privacy & Use policy. Please share your thoughts We recently updated our anonymous product survey; we welcome your feedback.

Indicators of Compromise

• cve — CVE-2026-39987

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