EUVD-2026-75562
GHSA-7ghq-v6jf-g56c
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Network-reachable with no auth or interaction required once HTTP/3 is enabled; A:L reflects partial DoS via backend pool exhaustion with no confidentiality or integrity impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
3DescriptionCVE.org
Traefik is an open source HTTP reverse proxy and load balancer. From 2.8.2 until 2.11.56 and 3.7.12, HTTP/3 entrypoints do not apply entryPoints..transport.respondingTimeouts.readTimeout because the timeout is enforced on a TCP connection and the HTTP/3 server has no corresponding QUIC stream deadline. An unauthenticated client can use a slow request body, trickling data indefinitely while holding a request and an upstream connection open and exhausting backends with bounded connection pools. This issue is fixed in 2.11.56 and 3.7.12.
AnalysisAI
HTTP/3 read timeout non-enforcement in Traefik allows unauthenticated remote attackers to exhaust upstream backend connection pools by trickling request body data indefinitely over QUIC streams. Versions 2.8.2 through 2.11.55 and 3.x through 3.7.11 fail to apply the configured readTimeout to HTTP/3 entrypoints because that timeout is enforced at the TCP connection layer and QUIC streams have no corresponding deadline. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | HTTP/3 must be explicitly enabled on a Traefik entrypoint via the `entryPoints.<name>.http3` configuration block in the static configuration file - this is not enabled or present in default Traefik deployments and must be deliberately configured. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.3 Medium score with AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L accurately reflects the limited blast radius: this is a DoS-only vulnerability with no confidentiality or integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Traefik 2.11.56 or 3.7.12, confirmed available at https://github.com/traefik/traefik/releases/tag/v2.11.56 and https://github.com/traefik/traefik/releases/tag/v3.7.12 respectively. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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