Vulnerability-Lookup

CVE-2026-26205 (GCVE-0-2026-26205)

Vulnerability from cvelistv5 – Published: 2026-02-19 19:31 – Updated: 2026-02-19 21:22

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.

Severity

7.1 (High)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-19 20:54 UTC

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/open-policy-agent/opa-envoy-pl…	x_refsource_CONFIRM
https://github.com/open-policy-agent/opa-envoy-pl…	x_refsource_MISC
https://github.com/open-policy-agent/opa-envoy-pl…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
open-policy-agent	opa-envoy-plugin	Affected: < 1.13.2-envoy-2	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-26205

Vulnerability from fkie_nvd - Published: 2026-02-19 20:25 - Updated: 2026-06-17 10:25

Severity

7.1 (High) - 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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/open-policy-agent/opa-envoy-plugin/commit/58c44d4ec408d5852d1d0287599e7d5c5e2bc5c3
	security-advisories@github.com	https://github.com/open-policy-agent/opa-envoy-plugin/releases/tag/v1.13.2-envoy-2
	security-advisories@github.com	https://github.com/open-policy-agent/opa-envoy-plugin/security/advisories/GHSA-9f29-v6mm-pw6w

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
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    {
      "affectedData": [
        {
          "product": "opa-envoy-plugin",
          "vendor": "open-policy-agent",
          "versions": [
            {
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    },
    {
      "lang": "es",
      "value": "opa-envoy-plugin es un plugin para aplicar pol\u00edticas OPA con Envoy. Las versiones anteriores a 1.13.2-envoy-2 tienen una vulnerabilidad en c\u00f3mo se construye el campo \u0027input.parsed_path\u0027. Las rutas de solicitud HTTP se tratan como URIs completas al ser analizadas; interpretando los segmentos de ruta iniciales prefijados con barras dobles (\u0027//\u0027) como componentes de autoridad, y por lo tanto, elimin\u00e1ndolos de la ruta analizada. Esto crea una falta de coincidencia en la interpretaci\u00f3n de la ruta entre las pol\u00edticas de autorizaci\u00f3n y los servidores backend, permitiendo a los atacantes eludir los controles de acceso mediante la creaci\u00f3n de solicitudes donde el filtro de autorizaci\u00f3n eval\u00faa una ruta diferente a la que finalmente se sirve. La versi\u00f3n 1.13.2-envoy-2 soluciona el problema."
    }
  ],
  "id": "CVE-2026-26205",
  "lastModified": "2026-06-17T10:25:56.370",
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              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-02-19T20:54:43.231111Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-19T20:25:43.263",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-policy-agent/opa-envoy-plugin/commit/58c44d4ec408d5852d1d0287599e7d5c5e2bc5c3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-policy-agent/opa-envoy-plugin/releases/tag/v1.13.2-envoy-2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-policy-agent/opa-envoy-plugin/security/advisories/GHSA-9f29-v6mm-pw6w"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-9F29-V6MM-PW6W

Vulnerability from github – Published: 2026-02-18 15:25 – Updated: 2026-02-19 21:56

Summary

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

Details

A security vulnerability has been discovered 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.

Attack example

HTTP request:

GET //admin/users HTTP/1.1
Host: example.com

Policy sees:

The leading //admin path segment is interpreted as an authority component, and dropped from input.parsed_path field:

{
  "parsed_path": ["users"]
}

Backend receives:

//admin/users path, normalized to /admin/users.

Affected Request Pattern Examples

Request path	`input.parsed_path`	`input.attributes.request.http.path`	Discrepancy
/	[""]	/	✅ None
//foo	[""]	//foo	❌ Mismatch
/admin	["admin"]	/admin	✅ None
/admin/users	["admin", "users"]	/admin/users	✅ None
//admin/users	["users"]	//admin/users	❌ Mismatch

Impact

Users are impacted if all the following conditions apply:

Protected resources are path-hierarchical (e.g., /admin/users vs /users)
Authorization policies use input.parsed_path for path-based decisions
Backend servers apply lenient path normalization

Patches

Go: v1.13.2-envoy-2 Docker: 1.13.2-envoy-2, 1.13.2-envoy-2-static

Workarounds

Users who cannot immediately upgrade opa-envoy-plugin are recommended to apply one, or more, of the workarrounds described below.

1. Enable the `merge_slashes` Envoy configuration option

As per Envoy best practices, enabling the merge_slashes configuration option in Envoy will remove redundant slashes from the request path before filtering is applied, effectively mitigating the input.parsed_path issue described in this advisory.

2. Use `input.attributes.request.http.path` instead of `input.parsed_path` in policies

The input.attributes.request.http.path field contains the unprocessed, raw request path. Users are recommended to update any policy using input.parsed_path to instead use the input.attributes.request.http.path field.

Example

package example

# Use instead of input.parsed_path
parsed_path := split(                                        # tokenize into array
    trim_left(                                               # drop leading slashes
        urlquery.decode(input.attributes.request.http.path), # url-decode the path
        "/",
    ),
    "/",
)

Severity

7.1 (High)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.13.1-envoy"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/open-policy-agent/opa-envoy-plugin"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.13.2-envoy-2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-26205"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-18T15:25:04Z",
    "nvd_published_at": "2026-02-19T20:25:43Z",
    "severity": "HIGH"
  },
  "details": "A security vulnerability has been discovered 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](https://datatracker.ietf.org/doc/html/rfc3986#section-3.2) 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.\n\n#### Attack example\n\n**HTTP request:**\n\n```\nGET //admin/users HTTP/1.1\nHost: example.com\n```\n\n**Policy sees:**\n\nThe leading `//admin` path segment is interpreted as an authority component, and dropped from `input.parsed_path` field:\n\n\n```json\n{\n  \"parsed_path\": [\"users\"]\n}\n```\n\n**Backend receives:**\n\n`//admin/users` path, normalized to `/admin/users`.\n\n#### Affected Request Pattern Examples\n\n| Request path | `input.parsed_path` | `input.attributes.request.http.path` | Discrepancy |\n| - | - | - | - |\n| / | [\"\"] | / | \u2705 None |\n| //foo  | [\"\"] | //foo| \u274c Mismatch |\n| /admin | [\"admin\"] | /admin | \u2705 None |\n| /admin/users | [\"admin\", \"users\"] |  /admin/users | \u2705 None |\n| //admin/users  | [\"users\"] | //admin/users | \u274c Mismatch |\n\n### Impact\n\nUsers are impacted if all the following conditions apply:\n\n1. Protected resources are path-hierarchical (e.g., `/admin/users` vs `/users`)\n2. Authorization policies use `input.parsed_path` for path-based decisions\n3. Backend servers apply lenient path normalization\n\n### Patches\n\nGo: `v1.13.2-envoy-2`\nDocker: `1.13.2-envoy-2`, `1.13.2-envoy-2-static`\n\n### Workarounds\n\nUsers who cannot immediately upgrade opa-envoy-plugin are recommended to apply one, or more, of the workarrounds described below.\n\n#### 1. Enable the `merge_slashes` Envoy configuration option\n\nAs per [Envoy best practices](https://www.envoyproxy.io/docs/envoy/v1.37.0/configuration/best_practices/edge.html), enabling the [merge_slashes](https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/filters/network/http_connection_manager/v3/http_connection_manager.proto#envoy-v3-api-field-extensions-filters-network-http-connection-manager-v3-httpconnectionmanager-merge-slashes) configuration option in Envoy will remove redundant slashes from the request path before filtering is applied, effectively mitigating the `input.parsed_path` issue described in this advisory.\n\n\n#### 2. Use `input.attributes.request.http.path` instead of `input.parsed_path` in policies\n\nThe `input.attributes.request.http.path` field contains the unprocessed, raw request path. Users are recommended to update any policy using `input.parsed_path` to instead use the `input.attributes.request.http.path` field.\n\n##### Example ####\n\n```rego\npackage example\n\n# Use instead of input.parsed_path\nparsed_path := split(                                        # tokenize into array\n\ttrim_left(                                               # drop leading slashes\n\t\turlquery.decode(input.attributes.request.http.path), # url-decode the path\n\t\t\"/\",\n\t),\n\t\"/\",\n)\n```",
  "id": "GHSA-9f29-v6mm-pw6w",
  "modified": "2026-02-19T21:56:34Z",
  "published": "2026-02-18T15:25:04Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/open-policy-agent/opa-envoy-plugin/security/advisories/GHSA-9f29-v6mm-pw6w"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26205"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-policy-agent/opa-envoy-plugin/commit/58c44d4ec408d5852d1d0287599e7d5c5e2bc5c3"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/open-policy-agent/opa-envoy-plugin"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-policy-agent/opa-envoy-plugin/releases/tag/v1.13.2-envoy-2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "opa-envoy-plugin has an Authorization Bypass via Double-Slash Path Misinterpretation in input.parsed_path"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-26205 (GCVE-0-2026-26205)

FKIE_CVE-2026-26205

GHSA-9F29-V6MM-PW6W

Attack example

Affected Request Pattern Examples

Impact

Patches

Workarounds

1. Enable the merge_slashes Envoy configuration option

2. Use input.attributes.request.http.path instead of input.parsed_path in policies

Example

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour

1. Enable the `merge_slashes` Envoy configuration option

2. Use `input.attributes.request.http.path` instead of `input.parsed_path` in policies