Socket.IO: Engine.IO Protocol Revision Mismatch DoS
High-risk advisory
CVE-2026-102599
Summary
Socket.IO: Engine.IO Protocol Revision Mismatch DoS
Why it matters
GitHub has published a reviewed security advisory for engine.io. Prioritize it with other application dependency updates.
Operator check
Check whether engine.io is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.