{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.11.41"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "f2c198c9f36e97895f045e83ad2050ad21e52f86"
            }
          ],
          "repo": "https://github.com/traefik/traefik",
          "type": "GIT"
        },
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "3.0.0-beta1"
              },
              {
                "fixed": "3.6.11"
              }
            ]
          },
          "events": [
            {
              "introduced": "519ed8bde58e9ebc6d9618a38a351208820cf273"
            },
            {
              "fixed": "33219a0af86c41a8db81d37c444f65172bfb3e35"
            }
          ],
          "repo": "https://github.com/traefik/traefik",
          "type": "GIT"
        },
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "3.7.0-ea.1"
              },
              {
                "fixed": "3.7.0-ea.2"
              }
            ]
          },
          "events": [
            {
              "introduced": "67c64ed9b25fbb90f1086977a62827133a7aa01b"
            },
            {
              "fixed": "d7de8ee4f32d2634f729fda28ba451acfc79f724"
            }
          ],
          "repo": "https://github.com/traefik/traefik",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-g3hg-j4jv-cwfr"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-208"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32595.json"
  },
  "details": "Traefik is an HTTP reverse proxy and load balancer. Versions 2.11.40 and below, 3.0.0-beta1 through 3.6.11, and 3.7.0-ea.1 comtain BasicAuth middleware that allows username enumeration via a timing attack. When a submitted username exists, the middleware performs a bcrypt password comparison taking ~166ms. When the username does not exist, the response returns immediately in ~0.6ms. This ~298x timing difference is observable over the network and allows an unauthenticated attacker to reliably distinguish valid from invalid usernames. This issue is patched in versions 2.11.41, 3.6.11 and 3.7.0-ea.2.",
  "id": "CVE-2026-32595",
  "modified": "2026-04-01T23:10:09.565195523Z",
  "published": "2026-03-20T10:08:41.636Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v2.11.41"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v3.6.11"
    },
    {
      "type": "WEB",
      "url": "https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32595.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-g3hg-j4jv-cwfr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32595"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Traefik: BasicAuth Middleware Timing Attack Allows Username Enumeration"
}