Security advisory

{
  "id": "da20a8a80c0bb49e6824401cee2686b1c89303bdc23663a3b5262e91bcadc272",
  "url": "https://osv.dev/vulnerability/CVE-2021-39156",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-39156",
    "summary": "Istio is an open source platform for providing a uniform way to integrate microservices, manage traffic flow across microservices, enforce policies and aggregate telemetry data. Istio 1.11.0, 1.10.3 and below, and 1.9.7 and below contain a remotely exploitable vulnerability where an HTTP request with `#fragment` in the path may bypass Istio’s URI path based authorization policies. Patches are available in Istio 1.11.1, Istio 1.10.4 and Istio 1.9.8. As a work around a Lua filter may be written to normalize the path.",
    "evidence": "osv:CVE-2021-39156",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-39156",
      "aliases": [
        "CVE-2021-39156",
        "GHSA-hqxw-mm44-gc4r"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/istio/istio",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "5336ff0f12bc093b728dac3a729b4b2bcbc3df65"
                },
                {
                  "introduced": "d26cba7e341587453ffeb978f5cf6fbc32f346f8"
                },
                {
                  "fixed": "61313778e0b785e401c696f5e92f47af069f96d0"
                },
                {
                  "introduced": "57d639a4fd19ee8c3559b9a4032f91e4d23c6f14"
                },
                {
                  "fixed": "ce6205d503e5c5e41af496ebbe01ece7dc6c3547"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.9.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.10.0"
                      },
                      {
                        "fixed": "1.10.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.11.0"
                      },
                      {
                        "fixed": "1.11.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.11.0-rc.4",
            "1.11.0-rc.3",
            "1.11.0-rc.2",
            "1.11.0-rc.1",
            "1.11.0-beta.3",
            "1.11.0-beta.2",
            "1.11.0-beta.1",
            "1.9.7",
            "1.11.0-beta.0",
            "1.10.1",
            "1.10.0",
            "1.9.4",
            "1.9.2",
            "1.9.1",
            "1.9.0",
            "1.9.0-rc.0",
            "1.9.0-beta.1",
            "1.9.0-beta.0",
            "1.7.0-alpha.0",
            "1.6.0-alpha.2",
            "1.6.0-alpha.1",
            "1.6.0-alpha.0",
            "1.5.0-beta.2",
            "1.5.0-beta.1",
            "1.5.0-alpha.0",
            "1.2.0-rc.3",
            "1.2.0-rc.0",
            "1.1.0-snapshot.2",
            "1.1.0.snapshot.1",
            "1.1.0.snapshot.0",
            "1.0.0-snapshot.0",
            "0.6.0",
            "0.5.0",
            "0.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-39156.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:53.413989729Z",
      "provider": "osv",
      "references": [
        "https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r",
        "https://istio.io/latest/news/security/istio-security-2021-008"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-39156",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386376,
  "published_at": "2021-08-24T23:15:10.413+00:00"
}