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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

CVE-2026-44774 lets a Kubernetes tenant with HTTPRoute rights expose Traefik’s internal REST provider despite providers.rest.insecure=false. In shared Gateway deployments with the REST provider enabled, this can let a low-privileged actor change live Traefik routing configuration.

Executive priority

Prioritize remediation for multi-tenant Kubernetes ingress environments. The issue can turn limited route-management permissions into live proxy reconfiguration capability, creating meaningful outage and traffic-control risk.

Technical view

Affected Traefik Gateway API provider versions accept TraefikService backends whose names end in @internal. That permits routing to rest@internal, not only the intended api@internal. The impact is unauthorized dynamic configuration writes, with high integrity and availability impact. Fixed versions are 2.11.46, 3.6.17, and 3.7.1.

Likely exposure

Exposure is most likely in Kubernetes environments using Traefik Gateway API with shared tenant control, REST provider enabled, and delegated HTTPRoute creation permissions.

Exploitation context

The source bundle reports no CISA KEV listing and provides no evidence of active exploitation. Exploitation requires network access and low privileges in the form of HTTPRoute creation rights.

Researcher notes

The key boundary failure is overly broad acceptance of @internal TraefikService backends by the Gateway provider. Evidence supports affected version ranges and fixed releases, but the bundle does not include exploit telemetry or detailed patch diff analysis.

Mitigation direction

  • Upgrade Traefik to 2.11.46, 3.6.17, 3.7.1, or later.
  • Review vendor advisories for environment-specific remediation guidance.
  • Limit HTTPRoute creation rights in shared Gateway deployments until upgraded.
  • Assess whether the REST provider is enabled and required.
  • Audit tenant-controlled routes for internal TraefikService backend references.

Validation and detection

  • Inventory Traefik versions across Kubernetes Gateway API deployments.
  • Identify clusters where tenants can create HTTPRoutes.
  • Check whether the REST provider is enabled in those deployments.
  • Review HTTPRoute and TraefikService backend references for @internal targets.
  • Confirm upgraded deployments run a fixed Traefik version.
Prepared
Confidence
high
Sources
10

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.

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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.

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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.

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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.

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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