CVE-2022-39271 Traefik HTTP/2 connections management could cause a denial of service
Traefik reverse proxy allows attackers to cause a denial of service by hanging HTTP/2 server connections via fatal errors.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-39271?
CVE-2022-39271 is a high-severity denial of service vulnerability in Traefik Traefik, published on 11 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Traefik (pronounced traffic) is a modern HTTP reverse proxy and load balancer that assists in deploying microservices. There is a potential vulnerability in Traefik managing HTTP/2 connections. A closing HTTP/2 server connection could hang forever because of a subsequent fatal error. This failure mode could be exploited to cause a denial of service. There has been a patch released in versions 2.8.8 and 2.9.0-rc5. There are currently no known workarounds.
Which versions are affected by CVE-2022-39271?
4 open source packages ship an affected version, including github.com/traefik/traefik/v2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/traefik/traefik/v2 Go | All versions | 2.8.8 |
github.com/traefik/traefik/v2 Go | All versions | 2.8.8 |
github.com/traefik/traefik/v2 Go | From 2.9.0-rc1 | 2.9.0-rc5 |
github.com/traefik/traefik/v2 Go | From 2.9.0-rc1 | 2.9.0-rc5 |
Products include Traefik Traefik.
How do I fix CVE-2022-39271?
Upgrade github.com/traefik/traefik/v2 to a fixed version for your release line: 2.8.8 or 2.9.0-rc5.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-39271 being exploited?
There is no known exploitation of CVE-2022-39271 in the wild and no public exploit code.
Other vulnerabilities in Traefik Traefik
- CVE-2024-45410 HTTP client can remove the X-Forwarded headers in Traefik
- CVE-2026-88877 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect
- CVE-2026-85595 Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
- CVE-2026-88007 Traefik HTTP/3 Backend NTLM Connection Reuse
- CVE-2026-88009 Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
Sources
Also known as ECHO-a0fe-769b-5c5b, GHSA-c6hx-pjc3-7fqr.