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CVE-2026-112778

8.8, high

traefik Missing Authorization Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.8, high high CVSS v3.1
EPSS, next 30 days
0.2% higher than 7.9% of scored CVEs
Exploitation
No public evidence
Published
19 Oct 20265 days ago

Description

Traefik before 2.11.46, 3.x before 3.6.17, and 3.7.0 lack namespace validation for Ingress and Service annotations in the Kubernetes Ingress provider, allowing references to Middlewares, ServersTransports, and TLSOptions in other namespaces. Attackers able to create or update Ingress or Service resources in one namespace can set router.middlewares or service.serverstransport annotations to obtain another tenant's injected credentials or reuse its client certificates, bypassing namespace-based tenant isolation.

Details

Vendor
Traefik
Product
traefik
Weakness
CWE-862 (opens in a new tab)
Status
Analyzed
Updated
23 Oct 2026
Assigner
disclosure@vulncheck.com

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

References 2

Patches and fixes 1

Advisories 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Traefik CVEs

Every Traefik CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-114635 traefik Authentication Bypass Using an Alternate Path or Channel Vulnerability EPSS 0.2% 8.7, high
  • CVE-2026-114636 traefik Missing Authentication for Critical Function Vulnerability EPSS 0.3% 8.7, high
  • CVE-2026-114637 Traefik from v3.2.0 before v3.7.14 contains an authentication bypass vulnerability in the experimental FastProxy connection pool, which… EPSS 0.3% 8.7, high
  • CVE-2026-114638 traefik Improper Authentication Vulnerability EPSS 0.2% 8.7, high
  • CVE-2026-114639 traefik Improper Authentication Vulnerability EPSS 0.3% 8.7, high
  • CVE-2026-114640 Traefik from v3.7.0 before v3.7.14 contains an authentication bypass vulnerability in its Kubernetes Ingress-NGINX provider that… EPSS 0.2% 8.7, high
  • CVE-2026-114642 Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 stores its NTLM/Kerberos backend round tripper in a client-connection slot not… EPSS 0.2% 8.7, high
  • CVE-2026-114656 Traefik before 2.11.58 and 3.7.13 contains an authentication bypass vulnerability that allows unauthenticated clients to skip… EPSS 0.2% 7.5, high

Beyond this page

Is CVE-2026-112778 in your network?

This page tells you how dangerous CVE-2026-112778 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-112778 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 24 Oct 2026, not the live upstream state.