CVE-2026-54764
published 2026-07-06CVE-2026-54764: Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's ForwardAuth middleware, even when configured with…
PriorityP337medium5.8CVSS 3.1
AVNACLPRNUINSCCNILAN
EPSS
0.28%
20.4th percentile
Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.
Affected
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| devspaces | traefik-rhel9 | — | — |
| github.com | traefik_traefik | 0 – 1.7.34 | — |
| github.com | traefik_traefik_v2 | >= 0 < 2.11.51 | 2.11.51 |
| github.com | traefik_traefik_v3 | >= 0 < 3.6.22 | 3.6.22 |
| github.com | traefik_traefik_v3 | >= 3.7.0 < 3.7.6 | 3.7.6 |
| traefik | traefik | < 2.11.51 | 2.11.51 |
| traefik | traefik | — | — |
| traefik | traefik | — | — |
| traefik | traefik | >= 3.0.0 < 3.6.22 | 3.6.22 |
| traefik | traefik | >= 3.7.0 < 3.7.6 | 3.7.6 |
CVSS provenance
nvdv3.15.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
nvdv4.06.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat5.8MEDIUM
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GHSA
Traefik: ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false
ghsa·2026-08-06
CVE-2026-54764 [MEDIUM] CWE-345 Traefik: ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false
Traefik: ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false
## Summary
There is a medium severity vulnerability in Traefik's ForwardAuth middleware. Even when configured with `trustForwardHeader: false`, Traefik derives the `X-Forwarded-Port` header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an `X-Forwarded-Proto: https` header over a plain HTTP connection and cause Traefik to forward `X-Forwarded-Port: 443` to the auth service, bypassing port-based authorization checks. This is a regression of the incomplete fix for GHSA-6384-m2mw-rf54, which addressed the `X-Forwarded-Proto` and `X-Forwarded-P
VulDB
Traefik up to 2.11.50/3.6.21/3.7.5 ForwardAuth Middleware improper authorization
vuldb·2026-07-06·CVSS 6.9
CVE-2026-54764 [MEDIUM] Traefik up to 2.11.50/3.6.21/3.7.5 ForwardAuth Middleware improper authorization
A vulnerability marked as problematic has been reported in Traefik up to 2.11.50/3.6.21/3.7.5. This affects an unknown function of the component ForwardAuth Middleware. Performing a manipulation results in improper authorization.
This vulnerability is reported as CVE-2026-54764. The attack is possible to be carried out remotely. No exploit exists.
Red Hat
traefik: Traefik: Authorization bypass in ForwardAuth middleware via forged X-Forwarded-Port
vendor_redhat·2026-07-06·CVSS 5.8
CVE-2026-54764 [MEDIUM] CWE-348 traefik: Traefik: Authorization bypass in ForwardAuth middleware via forged X-Forwarded-Port
traefik: Traefik: Authorization bypass in ForwardAuth middleware via forged X-Forwarded-Port
Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.
A flaw was found in Traefik, an HTTP reverse proxy and load balan
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-54764 traefik: Traefik: Authorization bypass in ForwardAuth middleware via forged X-Forwarded-Port
bugzilla·2026-07-06·CVSS 5.8
CVE-2026-54764 [MEDIUM] CVE-2026-54764 traefik: Traefik: Authorization bypass in ForwardAuth middleware via forged X-Forwarded-Port
CVE-2026-54764 traefik: Traefik: Authorization bypass in ForwardAuth middleware via forged X-Forwarded-Port
Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.
Bugzilla
CVE-2025-54764 dolphin-emu: Mbedtls timing attacks in RSA operations [fedora-42]
bugzilla·2025-10-20·CVSS 6.2
CVE-2025-54764 [MEDIUM] CVE-2025-54764 dolphin-emu: Mbedtls timing attacks in RSA operations [fedora-42]
CVE-2025-54764 dolphin-emu: Mbedtls timing attacks in RSA operations [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports
Bugzilla
CVE-2025-54764 rust-psa-crypto-sys: Mbedtls timing attacks in RSA operations [fedora-42]
bugzilla·2025-10-20·CVSS 6.2
CVE-2025-54764 [MEDIUM] CVE-2025-54764 rust-psa-crypto-sys: Mbedtls timing attacks in RSA operations [fedora-42]
CVE-2025-54764 rust-psa-crypto-sys: Mbedtls timing attacks in RSA operations [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug
2026-07-06
Published