vulnerability · Tue 29 Sep 2026 · 23:44 UTC
GHSA-2gc4-cqfq-p2gv: Socket.IO: Engine.IO Protocol Revision Mismatch DoS
Filed UTCSource GTH ↗
A denial-of-service vulnerability exists in Engine.IO / Socket.IO servers that allow transport upgrades. The Engine.IO protocol revision is negotiated during the initial handshake and stored on the session, but a newly-created transport, including a WebSocket upgrade transport, could independently derive a different protocol revision from the upgrade request query parameters. The server did not verify that the protocol revision of an upgrade request matched the protocol revision of the existing session. …
Signals
as the pipeline stamped them- High
- High-risk vulnerability — CVSS 7.5
CVE
KEV from CISA · EPSS from FIRST| Id | KEV | EPSS | Reference |
|---|---|---|---|
| CVE-2026-102599 | — | 0.58% | NVD ↗ |
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