Answer in brief
CVE-2026-29054 records a High severity (CVSS 7.5) vulnerability in Traefik: lowercase `Connection` tokens can delete traefik-managed forwarded identity headers (for example, `X-Real-Ip`). The current sources do not mark it as known exploited. The current feed maps traefik/traefik (generic), github.com/traefik/traefik (go), github.com/traefik/traefik/v2 (go), github.com/traefik/traefik/v3 (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps traefik/traefik (generic), github.com/traefik/traefik (go), github.com/traefik/traefik/v2 (go), github.com/traefik/traefik/v3 (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| traefik/traefikgeneric | >= 2.11.9, < 2.11.38 || >= 3.1.3, < 3.6.9 | Not reported |
| github.com/traefik/traefikgo | >=0 | Not reported |
| github.com/traefik/traefik/v2go | >=2.11.9 <2.11.38 | 2.11.38 |
| github.com/traefik/traefik/v3go | >=3.1.3 <3.6.9 | 3.6.9 |
Published upstream
Mar 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 15, 2026
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 deletion operates case-insensitively. As a result, a remote unauthenticated client can use lowercase Connection tokens (e.g. Connection: x-real-ip) to bypass the protection and trigger the removal of Traefik-managed forwarded identity headers. This issue has been patched in versions 2.11.38 and 3.6.9.
Quoted source text, attributed separately from HOL analysis.