What’s Vulnerable › Vulnerabilities

CVE-2022-39271: Traefik HTTP/2 connections management could cause a denial of service

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-10-11 · updated 2026-06-17
• Weakness: CWE-400

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.

Affected products

• Traefik: before 2.8.8; 2.9.0-rc1, 2.9.0-rc2, 2.9.0-rc3, 2.9.0-rc4 — fixed in 2.8.8

How to fix

Upgrade to a fixed version: Traefik 2.8.8. Check the vendor advisory for mitigations.

References

• https://github.com/traefik/traefik/releases/tag/v2.8.8
• https://github.com/traefik/traefik/releases/tag/v2.9.0-rc5
• https://github.com/traefik/traefik/security/advisories/GHSA-c6hx-pjc3-7fqr
• https://github.com/traefik/traefik/releases/tag/v2.8.8
• https://github.com/traefik/traefik/releases/tag/v2.9.0-rc5
• https://github.com/traefik/traefik/security/advisories/GHSA-c6hx-pjc3-7fqr

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