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Splunk CVE-2026-20253 remediation runbook showing the PostgreSQL sidecar disable workaround

Engineering · Aug 6, 2026 · 10 min read

Splunk CVE-2026-20253: a 72-hour triage and remediation runbook

CVE-2026-20253 is the first Splunk vulnerability ever added to CISA's KEV catalog: an unauthenticated RCE via the PostgreSQL sidecar. Here is the version matrix, the temporary workaround, and an hour-by-hour SOC runbook.

Manu Shukla

#security #splunk #incident response