Socket.IO: Prototype Pollution via Unsafe Client Session Lookup
High-risk advisory
CVE-2026-102600
Summary
Socket.IO: Prototype Pollution via Unsafe Client Session Lookup
Why it matters
GitHub has published a reviewed security advisory for @socket.io/cluster-engine. Prioritize it with other application dependency updates, especially because EPSS places it in the 28% percentile.
Operator check
Check whether @socket.io/cluster-engine is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. EPSS probability: 0.4%; percentile: 28%.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.