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CVE Record

CVE-2026-44774: Traefik: Gateway API TraefikService backend accepts rest@internal, allowing unauthorized exposure of the REST provider despite providers.rest.insecure=false

Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.46, 3.6.17, and 3.7.1, Traefik's Kubernetes Gateway API provider allows a tenant with HTTPRoute creation permissions to expose the REST provider handler, bypassing the providers.rest.insecure=false setting. The Gateway provider accepts any TraefikService backend reference whose name ends with @internal, making it possible to route traffic to rest@internal in addition to the intended api@internal. In shared Gateway deployments where the REST provider is enabled, this allows a low-privileged actor to gain live dynamic configuration write access to Traefik, enabling unauthorized reconfiguration of routers and services. This vulnerability is fixed in 2.11.46, 3.6.17, and 3.7.1.

HighCVSS 8.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A tenant allowed to create Kubernetes HTTPRoutes could expose Traefik’s normally protected REST interface. In shared deployments, this could let a low-privileged user change live routing and service configuration, potentially disrupting traffic or exposing data. Risk requires the Gateway API provider and enabled REST provider.

Executive priority

Treat as a high-priority upgrade for multi-tenant or delegated Kubernetes environments. The vulnerability crosses an intended security boundary and can affect traffic integrity and availability. Accelerate remediation where untrusted teams can create HTTPRoutes; validate configuration before downgrading priority elsewhere.

Technical view

Affected Traefik Gateway API versions accept TraefikService backend names ending in @internal, permitting rest@internal instead of only the intended api@internal. This bypasses providers.rest.insecure=false and can provide dynamic configuration write access. CVSS 3.1 is 8.3, reflecting network reachability, low complexity, limited privileges, and high integrity and availability impact.

Likely exposure

Exposure is most likely in shared Kubernetes Gateway deployments running Traefik before 2.11.46, 3.6.17, or 3.7.1, with the REST provider enabled and tenants able to create HTTPRoutes. Deployments without those conditions are not shown as exploitable by the supplied evidence.

Exploitation context

The supplied record does not establish active exploitation, and the CVE is not listed as KEV. Exploitation requires an actor with HTTPRoute creation permission; it is not described as unauthenticated. Successful abuse could enable unauthorized changes to routers and services through the exposed REST handler.

Researcher notes

The flaw is an authorization and configuration-validation failure, mapped to CWE-15 and CWE-284. The supplied evidence identifies backend-name suffix acceptance as the bypass. It does not provide evidence of public exploitation, affected configurations beyond those stated, or compromise indicators specific to this CVE.

Mitigation direction

  • Upgrade to Traefik 2.11.46, 3.6.17, 3.7.1, or a later supported release.
  • Prioritize shared Gateway deployments where tenants can create HTTPRoutes.
  • Until upgraded, restrict HTTPRoute creation permissions to trusted administrators.
  • Disable the REST provider if operationally unnecessary, following vendor guidance.
  • Review Traefik and Red Hat advisories for platform-specific remediation details.

Validation and detection

  • Inventory Traefik versions across Kubernetes Gateway deployments.
  • Confirm whether the Gateway API provider and REST provider are enabled.
  • Identify principals permitted to create or modify HTTPRoutes.
  • Review HTTPRoutes for TraefikService references ending in @internal, especially rest@internal.
  • Verify upgraded instances report a fixed or later supported version.
  • Audit recent routing and service changes for unauthorized reconfiguration.
Prepared
Confidence
high
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-15: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cwe · medium confidence lookup

CWE-284: Authorization and privilege behavior lookup

Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Container behavior lookup

The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-44774 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
8.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
9Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.3CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H2.85.5redhat-SADP
6.4CVSS 4.0MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:H——GitHub_M

Vulnerability scoring details

Base CVSS 4.0 score

6.4Medium
CVSS 4.0 vector shape for CVE-2026-44774Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPtraefik: Traefik: Privilege escalation via Kubernetes Gateway API provider configuration bypass
other:Red Hat severity ratingcvssV3_1
  • 2026-05-15T17:01:12.579Z: Reported to Red Hat.
  • 2026-05-15T16:30:43.265Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
traefiktraefik< 2.11.46, >= 3.0.0-beta1, < 3.6.17, >= 3.7.0-rc.0, < 3.7.1Listed
Weakness

CWE details

CWE-15CWE-284

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-15 · source CWE mapping

External Control of System or Configuration Setting

External Control of System or Configuration Setting represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs
CWE-284 · source CWE mapping

Improper Access Control

Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs