Traefik is an HTTP reverse proxy and load balancer. Versions prior to 2.11.6, 3.0.4, and 3.1.0-rc3 have a vulnerability that allows bypassing IP allow-lists via HTTP/3 early data requests in QUIC 0-RTT handshakes sent with spoofed IP addresses. Versions 2.11.6, 3.0.4, and 3.1.0-rc3 contain a patch for this issue. No known workarounds are available.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| github.com/traefik/traefik/v2(Go) | 0 | 2.11.6 | N/A |
| github.com/traefik/traefik/v3(Go) | 3.0.0-beta3 | 3.0.4 | N/A |
| github.com/traefik/traefik/v3(Go) | 3.1.0-rc1 | 3.1.0-rc3 | N/A |
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