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opa-envoy-plugin has an Authorization Bypass via Double-Slash Path Misinterpretation in `input.parsed_path`

Type: advisorySources: OSV

opa-envoy-plugun is a plugin to enforce OPA policies with Envoy. Versions prior to 1.13.2-envoy-2 have a vulnerability in how the `input.parsed_path` field is constructed. HTTP request paths are treated as full URIs when parsed; interpreting leading path segments prefixed with double slashes (`//`) as authority components, and therefore dropping them from the parsed path. This creates a path interpretation mismatch between authorization policies and backend servers, enabling attackers to bypass access controls by crafting requests where the authorization filter evaluates a different path than the one ultimately served. Version 1.13.2-envoy-2 fixes the issue.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-26205
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 20:19 UTC · Revision 1

Source evidence

opa-envoy-plugin has an Authorization Bypass via Double-Slash Path Misinterpretation in `input.parsed_path`

core-osv · Original source

Published 19 Feb 2026, 19:31 UTC

opa-envoy-plugun is a plugin to enforce OPA policies with Envoy. Versions prior to 1.13.2-envoy-2 have a vulnerability in how the `input.parsed_path` field is constructed. HTTP request paths are treated as full URIs when parsed; interpreting leading path segments prefixed with double slashes (`//`) as authority components, and therefore dropping them from the parsed path. This creates a path interpretation mismatch between authorization policies and backend servers, enabling attackers to bypass access controls by crafting requests where the authorization filter evaluates a different path than the one ultimately served. Version 1.13.2-envoy-2 fixes the issue.

osv:CVE-2026-26205
Complete source record
{
  "id": "394a3eb294297e2ed3c8d5525d4295277be0c28b589de2414f4d02a8e2e2c94f",
  "url": "https://osv.dev/vulnerability/CVE-2026-26205",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "opa-envoy-plugin has an Authorization Bypass via Double-Slash Path Misinterpretation in `input.parsed_path`",
    "summary": "opa-envoy-plugun is a plugin to enforce OPA policies with Envoy. Versions prior to 1.13.2-envoy-2 have a vulnerability in how the `input.parsed_path` field is constructed. HTTP request paths are treated as full URIs when parsed; interpreting leading path segments prefixed with double slashes (`//`) as authority components, and therefore dropping them from the parsed path. This creates a path interpretation mismatch between authorization policies and backend servers, enabling attackers to bypass access controls by crafting requests where the authorization filter evaluates a different path than the one ultimately served. Version 1.13.2-envoy-2 fixes the issue.",
    "evidence": "osv:CVE-2026-26205",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-26205",
      "aliases": [
        "CVE-2026-26205",
        "GHSA-9f29-v6mm-pw6w",
        "GO-2026-4506"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/open-policy-agent/opa-envoy-plugin",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0f0ab2d502dd44038fbae0fa1e6e0f1ff71558c6"
                },
                {
                  "fixed": "58c44d4ec408d5852d1d0287599e7d5c5e2bc5c3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.13.2-envoy-2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "58c44d4ec408d5852d1d0287599e7d5c5e2bc5c3"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0f0ab2d502dd44038fbae0fa1e6e0f1ff71558c6"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.13.2-envoy-2"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.13.1-envoy",
            "v1.13.0-envoy",
            "v1.12.2-envoy",
            "v1.12.1-envoy",
            "v1.12.0-envoy",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26205.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.697413228Z",
      "provider": "osv",
      "references": [
        "https://github.com/open-policy-agent/opa-envoy-plugin/releases/tag/v1.13.2-envoy-2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26205.json",
        "https://github.com/open-policy-agent/opa-envoy-plugin/security/advisories/GHSA-9f29-v6mm-pw6w",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-26205",
        "https://github.com/open-policy-agent/opa-envoy-plugin/commit/58c44d4ec408d5852d1d0287599e7d5c5e2bc5c3"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-863"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26205.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-26205",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520288,
  "published_at": "2026-02-19T19:31:26.905+00:00"
}