Traefik HTTP/2 connections management could cause a denial of service
Priority MEDIUM 42CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0136 71st percentileScored 2026-11-07
Fix Fixed traefik (traefik): 2.8.8, 2.9.0-rc5github.com/traefik/traefik/v2 (Go): 2.8.8, 2.9.0-rc5
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| traefik | traefik | before 2.8.8; 2.9.0-rc1 to before 2.9.0-rc5 | 2.8.8, 2.9.0-rc5 | Patch available | CNA |
| — | github.com/traefik/traefik/v2 (Go) | before 2.8.8 | 2.8.8 | Patch available | GHSA-c6hx-pjc3-7fqr |
| — | github.com/traefik/traefik/v2 (Go) | 2.9.0-rc1 to before 2.9.0-rc5 | 2.9.0-rc5 | Patch available | GHSA-c6hx-pjc3-7fqr |
- traefik Vendortraefik Affected before 2.8.8; 2.9.0-rc1 to before 2.9.0-rc5 Fixed in 2.8.8, 2.9.0-rc5 Patch available CNA
- github.com/traefik/traefik/v2 (Go) Vendor— Affected before 2.8.8 Fixed in 2.8.8 Patch available GHSA-c6hx-pjc3-7fqr
- github.com/traefik/traefik/v2 (Go) Vendor— Affected 2.9.0-rc1 to before 2.9.0-rc5 Fixed in 2.9.0-rc5 Patch available GHSA-c6hx-pjc3-7fqr
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* | before 2.8.8 | Vulnerable | traefik |
| cpe:2.3:a:traefik:traefik:2.9.0:rc1:*:*:*:*:*:* | 2.9.0 rc1 | Vulnerable | traefik |
| cpe:2.3:a:traefik:traefik:2.9.0:rc2:*:*:*:*:*:* | 2.9.0 rc2 | Vulnerable | traefik |
| cpe:2.3:a:traefik:traefik:2.9.0:rc3:*:*:*:*:*:* | 2.9.0 rc3 | Vulnerable | traefik |
| cpe:2.3:a:traefik:traefik:2.9.0:rc4:*:*:*:*:*:* | 2.9.0 rc4 | Vulnerable | traefik |
- cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* Versions before 2.8.8 Vulnerable ·traefik
- cpe:2.3:a:traefik:traefik:2.9.0:rc1:*:*:*:*:*:* Versions 2.9.0 rc1 Vulnerable ·traefik
- cpe:2.3:a:traefik:traefik:2.9.0:rc2:*:*:*:*:*:* Versions 2.9.0 rc2 Vulnerable ·traefik
- cpe:2.3:a:traefik:traefik:2.9.0:rc3:*:*:*:*:*:* Versions 2.9.0 rc3 Vulnerable ·traefik
- cpe:2.3:a:traefik:traefik:2.9.0:rc4:*:*:*:*:*:* Versions 2.9.0 rc4 Vulnerable ·traefik
Remediation
- Fix · CNA traefik (traefik) Fixed in 2.8.8, 2.9.0-rc5
- Fix · GHSA-c6hx-pjc3-7fqr github.com/traefik/traefik/v2 (Go) Fixed in 2.8.8 Advisory →
- Fix · GHSA-c6hx-pjc3-7fqr github.com/traefik/traefik/v2 (Go) Fixed in 2.9.0-rc5 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2022-39271
- 2026-10-03 Alias added: GHSA-c6hx-pjc3-7fqr
References
More Traefik vulnerabilities
- TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
- TI-2023-25774 Uncontrolled Resource Consumption in Traefik CVSS 3.1HIGH 7.5
- TI-2025-40914 Traefik doesn't Prevent Path Normalization Bypass in Router + Middleware Rules CVSS 4.0MEDIUM 6.9
- TI-2022-07529 Authorization header displayed in the debug logs CVSS 3.1MEDIUM 6.5
- TI-2024-30459 HTTP client can remove the X-Forwarded headers in Traefik CVSS 3.1CRITICAL 9.8
- TI-2026-60261 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect CVSS 4.0CRITICAL 9.3
Sources
- CVE-2022-39271 · CVE Program
- CVE-2022-39271 · NVD
- FIRST EPSS
- GHSA-c6hx-pjc3-7fqr · GitHub Advisory Database · CC BY 4.0
- CVE-2022-39271 · Red Hat security data · CC BY 4.0
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