Review reviewHigh

CVE-2026-29054

traefik traefik, Red Hat OpenShift Dev Spaces 3.27

Traefik is an HTTP reverse proxy and load balancer. From version 2.11.9 to 2.11.37 and from version 3.1.3 to 3.6.8, there is a potential vulnerability in Traefik managing the Connection header with X-Forwarded headers. When Traefik processes HTTP/1.1 requests, the protection put in place to prevent the removal of Traefik-managed X-Forwarded headers (such as X-Real-Ip, X-Forwarded-Host, X-Forwarded-Port, etc.) via the Connection header does not handle case sensitivity correctly. The Connection tokens are compared case-sensitively against the protected header names, but the actual header dele...

CVSS: 7.5
EPSS: 0.47%
CISA KEV: Not listed
Published: 2026.03.06

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.47%

Technical severityCVSS 7.5

Vulnerability overview

Affected product and versions

Product: traefik traefik, Red Hat OpenShift Dev Spaces 3.27
Affected versions: >= >= 2.11.9, < 2.11.38, >= >= 3.1.3, < 3.6.9, >= 2.11.9 < 2.11.38, >= 3.1.3 < 3.6.9
Fixed versions: 2.11.38, 3.6.9

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that traefik traefik, Red Hat OpenShift Dev Spaces 3.27 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE: CWE-178