data/osv/GO-2026-5152.json

{
  "schema_version": "1.3.1",
  "id": "GO-2026-5152",
  "modified": "0001-01-01T00:00:00Z",
  "published": "0001-01-01T00:00:00Z",
  "aliases": [
    "CVE-2026-48491",
    "GHSA-5r4w-85f3-pw66"
  ],
  "summary": "Traefik: SNICheck ignores wildcard TLSOptions mappings in github.com/traefik/traefik",
  "details": "The SNICheck middleware in Traefik ignores wildcard TLSOptions mappings, allowing an unauthenticated attacker to bypass mTLS requirements by using a domain-fronted request. This occurs because the middleware compares the TLS options name used during the handshake with a pre-computed value that may not account for wildcard matches correctly when certain configuration models are applied.",
  "affected": [
    {
      "package": {
        "name": "github.com/traefik/traefik/v2",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.11.48"
            }
          ]
        }
      ],
      "ecosystem_specific": {
        "imports": [
          {
            "path": "github.com/traefik/traefik/v2/pkg/middlewares/snicheck",
            "symbols": [
              "SNICheck.ServeHTTP"
            ]
          }
        ]
      }
    },
    {
      "package": {
        "name": "github.com/traefik/traefik/v3",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "3.7.0"
            },
            {
              "fixed": "3.7.3"
            }
          ]
        }
      ],
      "ecosystem_specific": {
        "imports": [
          {
            "path": "github.com/traefik/traefik/v3/pkg/middlewares/snicheck",
            "symbols": [
              "SNICheck.ServeHTTP"
            ]
          }
        ]
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-5r4w-85f3-pw66"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v3.7.3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v3.6.19"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v2.11.48"
    }
  ],
  "database_specific": {
    "url": "https://pkg.go.dev/vuln/GO-2026-5152",
    "review_status": "REVIEWED"
  }
}